The IAG Stage 2.5 Short Block is designed to solve the majority of common problems which plague modified EJ20 engines, especially at higher horsepower levels. The IAG Stage 2.5 short block builds off our Stage 2 Tuff block's strengths by adding our proprietary closed deck system. This system strengthens and supports the cylinder walls to prevent cracks that can occur with increased cylinder pressures. (This is the most common issue when increasing horsepower.) The Stage 2.5 EJ20 Short Block also features 92.5mm JE Forged Pistons and IAG Spec H beam connecting rods, along with ACL or King Race bearings. These components also significantly strengthen the common failure points such as cracked ring lands and spun bearings. These blocks are intended to be used with 2.0l EJ20 cylinder heads.
IAG Performance Stage 2.5 EJ20 Subaru Closed Deck Short Block for 2002-2005 Subaru WRX | IAG-ENG-1258
IAG Performance Stage 2.5 EJ20 Subaru Closed Deck Short Block for 2002-2005 Subaru WRX | IAG-ENG-1258
Part Number: IAGIAG-ENG-1258
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STAGE 2.5 EJ20 2.0L SHORT BLOCK
THE PROBLEM SOLVER
BUILT WITH 100% NEW COMPONENTS
The IAG Stage 2.5 Short Block starts with brand new Subaru 2.0L engine case halves. Our machinists machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts, transforming the block into a solid deck. Next, a deck pair of deck plates are attached and the short block is bored and honed to 92.5mm in our in-house Sunnen SV-30 computer-controlled cylinder hone. IAG's in-house honing process allows us to set custom piston to wall clearances to ensure quiet operation and reduced oil consumption. The modified case halves are then assembled using a new Subaru 2.0L WRX crankshaft with improved oil passages and IAG-Spec Tuff H-Beam connecting rods with ARP rod bolts. IAG Short blocks feature ACL or King Race rod and main bearings and are all balanced and blueprinted. Finally, the case halves are sealed with new OEM main/case bolts and sealant.
CLOSED DECK FOR EXTRA STRENGTH
Our unique closed deck system significantly increases the strength of the OEM case halves. This process supports the cylinder walls at the top of the case to prevent flexing and possible cracking where the case bolt reliefs are cut into the back of the cylinder wall.
During the installation process, we machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts. Once the case has been machined we heat it in an oven while freezing the specially machined inserts with liquid nitrogen. The inserts are then pressed into place and then machined to a mirror finish.
The unique inserts feature small passages that allow needed coolant flow to the deck surface. This means that the closed deck system does not affect the block's cooling ability and will not cause overheating, even in daily drivers.
FORGED PISTONS
DESIGNED FOR BOOST
Each Stage 2.5 Short Block features IAG Spec JE FSR 92.5mm Forged Pistons. These 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. FSR forgings reduce mass and wear caused by friction without sacrificing strength. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, also this reduces weight significantly. Featuring smooth flowing radii on the domes and dishes, the design promotes excellent flame travel. The pistons are secured to the rods with .905 x 2.250" x .210" wall 9310 steel wrist pins with Tru Arc locks.
Stage 2.5 Closed Deck EJ20 Includes:
- Case Halves -Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 92.5mm.
- Pistons -IAG-Spec JE FSR 92.5mm 2618 Forged Pistons, Ring Set, .210" 9310 Steel Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
- Connecting Rods -IAG-Spec H-Beam / ARP2000 Rod Bolts.
- Rod / Main Bearings -ACL or King Race bearings.
- Crankshaft -New Subaru WRX 2.0L Crankshaft with improved oil passages.
- Case / Main Bolts -Standard FHI Subaru case bolts.
Compression Ratio:
- 8.5:1 on S20 Cylinder Heads (EJ20)
Vehicles:
- 2002 - 2005 Subaru Impreza WRX
Returns
Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately, we can’t offer you a refund or exchange. Please send an email to sales@jdmuscleusa.com or use our return portal located at the top of the page to set up a return.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Additional non-returnable items:
- Giftcards
- Special-ordered items, including anything custom products
If you choose to email us to initiate a return, please ensure to include the following information in your email:
- Your order number
- Item(s) that you wish to return
- Reason for returning
Please do NOT send your purchase back to the manufacturer
Please do NOT send back an item without setting up a return first
Depending on your method of payment, transaction fees might not be refundable which ranges between 2.3% - 6% of the order value. Note this is charged by a third-party payment provider, not us. You may receive a full refund if you choose to receive a store credit instead.
There are certain situations where only partial refunds are granted (if applicable)
- Any item not in its original condition/ is damaged or missing parts for reasons not due to our error
- Any item that is returned more than 30 days after delivery
Some manufacturers would charge a restocking fee ranging from 10% - 30% of the original order value. Below is a list of some but now all of them, please be mindful when placing the order / considering a return:
- ESR 30%
- JDMuscle 15%
- PLM 20%
Cancellation
Please ensure you have contacted us on availability before placing an order. All cancellations could be subject to 2.3% - 6% fee to cover transaction costs charged by third-party payment providers. You have 7 days to cancel an order, once the order has been processed(item packaged/ tracking number has been created), the cancellation will not be allowed but you may contact us for a return request if the item is eligible for return.
Special-ordered items cannot be canceled.
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 3-10 business days(depending on the payment provider). The restocking fee might be applicable as noted in the return section.
Late or missing refunds (if applicable)
Once you have received an email/text from us stating the refund has been processed, at this stage, it's completely out of our control but depends on the payment providers to decide when the refund will show up in your bank. As noted, depending on the payment provider the process can take up to 10 business days(usually 3-5). If you haven’t received a refund yet, please first check your bank statement. A lot of times instead of a new line showing a reversal charge/credit, the payment would just disappear from your pending section.
Contact your credit card company/financing company you used, it may take some time before your refund is officially posted but reaching out might help expedite the process.
If you’ve done all of the above and you still have not received your refund yet, please contact us at sales@JDMuscleUSA.com and one of our team members will provide assistance.
Sale items (if applicable)
Only full-priced items are eligible for return/refund.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at sales@JDMuscleUSA.com or use the return/exchange portal located on the top of the page.
Gifts
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be emailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
Shipping
You will be responsible for paying for your own shipping costs for returning your item unless the item was damaged/wrong/defective in which case we will cover shipping both ways. Initial shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item and take no responsibility for any loss or damage during the return shipping.
And please refer to the return shipping address as provided in the RMA / return instructions. A lot of times the return address can be different than the initial shipping address.
Pre-Installation Inspection Policy:
All parts or items received via mail must undergo a thorough inspection prior to installation. Any damage or imperfections identified during or after this inspection must be reported immediately to sales@jdmuscleusa.com, and the item should not be installed. Please note that reports of damage, defects, or imperfections submitted after installation will not be honored.
Returns
Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately, we can’t offer you a refund or exchange. Please send an email to sales@jdmuscleusa.com or use our return portal located at the top of the page to set up a return.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Additional non-returnable items:
- Giftcards
- Special-ordered items, including anything custom products
If you choose to email us to initiate a return, please ensure to include the following information in your email:
- Your order number
- Item(s) that you wish to return
- Reason for returning
Please do NOT send your purchase back to the manufacturer
Please do NOT send back an item without setting up a return first
Depending on your method of payment, transaction fees might not be refundable which ranges between 2.3% - 6% of the order value. Note this is charged by a third-party payment provider, not us. You may receive a full refund if you choose to receive a store credit instead.
There are certain situations where only partial refunds are granted (if applicable)
- Any item not in its original condition/ is damaged or missing parts for reasons not due to our error
- Any item that is returned more than 30 days after delivery
Some manufacturers would charge a restocking fee ranging from 10% - 30% of the original order value. Below is a list of some but now all of them, please be mindful when placing the order / considering a return:
- ESR 30%
- JDMuscle 15%
- PLM 20%
Cancellation
Please ensure you have contacted us on availability before placing an order. All cancellations could be subject to 2.3% - 6% fee to cover transaction costs charged by third-party payment providers. You have 7 days to cancel an order, once the order has been processed(item packaged/ tracking number has been created), the cancellation will not be allowed but you may contact us for a return request if the item is eligible for return.
Special-ordered items cannot be canceled.
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 3-10 business days(depending on the payment provider). The restocking fee might be applicable as noted in the return section.
Late or missing refunds (if applicable)
Once you have received an email/text from us stating the refund has been processed, at this stage, it's completely out of our control but depends on the payment providers to decide when the refund will show up in your bank. As noted, depending on the payment provider the process can take up to 10 business days(usually 3-5). If you haven’t received a refund yet, please first check your bank statement. A lot of times instead of a new line showing a reversal charge/credit, the payment would just disappear from your pending section.
Contact your credit card company/financing company you used, it may take some time before your refund is officially posted but reaching out might help expedite the process.
If you’ve done all of the above and you still have not received your refund yet, please contact us at sales@JDMuscleUSA.com and one of our team members will provide assistance.
Sale items (if applicable)
Only full-priced items are eligible for return/refund.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at sales@JDMuscleUSA.com or use the return/exchange portal located on the top of the page.
Gifts
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be emailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
Shipping
You will be responsible for paying for your own shipping costs for returning your item unless the item was damaged/wrong/defective in which case we will cover shipping both ways. Initial shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item and take no responsibility for any loss or damage during the return shipping.
And please refer to the return shipping address as provided in the RMA / return instructions. A lot of times the return address can be different than the initial shipping address.
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