The best SuperPro upgrade depends on what your car is doing wrong. If your WRX, STI, BRZ, or GR86 wanders on the highway or the rear toe won't hold alignment, SuperPro rear toe arms and control arm kits add the adjustability the factory hardware lacks — with coverage from the 08-25 WRX and 08-21 STI through the 13-23 BRZ. If you're chasing crisper steering response, the polyurethane bushing kits replace the soft OE rubber that deflects under load, starting with affordable pieces like 14mm front camber bolts and sway bar bushings.
Bushings are the quiet wear item in every suspension. The factory rubber isolators crack and deform with age, and each millimeter of deflection is steering precision and alignment stability lost. Polyurethane bushings resist that deflection while still isolating road harshness, which is why they're the go-to upgrade for cars that see both daily driving and weekend back roads.
Alignment hardware is the other half of the story. Many cars leave the factory with no rear camber or toe adjustment, which means a lowered car can never be aligned back into spec. Camber bolts, adjustable toe arms, and control arms with eccentric bushings give the alignment shop the range it needs — and kits like these are also the fix for cars that keep eating the inside edge of their tires.
SuperPro focuses on suspension bushings and alignment components, and this collection shows the full breadth of that specialty. The SPF bushing kits include pieces like the SPF3199K gear box cross-member isolator mounts and the SPF3817K rear trailing-arm front bushing kit, while the TRC control-arm line covers complete solutions — the TRC0007 rear adjustable toe arms and the rear control arm kit with adjustable toe arms among them. Fitment in this collection spans 08-25 WRX, 08-21 STI, 13-23 BRZ and 13-26 GR86, plus FRS/GT86, 14-16 Forester XT, and 05-09 Legacy GT variants, so check your year and model against the listing. For single pieces, the 14mm front camber bolt kit is the classic first alignment upgrade, and the rear adjustable toe arm kit is the fix for a rear end that won't stay in spec.
For more of the suspension system, browse Shop All Suspension, Aftermarket Control Arms, and Performance Sway Bars. Two related bushing specialists live here too: Whiteline and Energy Suspension Bushings. Our article on the best suspension upgrades for the 2022 WRX is a solid primer on how bushings fit into a handling build.
Do polyurethane bushings make the ride harsh?
They firm things up slightly compared to worn factory rubber, but quality kits are designed for street use — most drivers notice sharper response, not added harshness.
Do I need an alignment after installing control arms or bushings?
Yes, always. Any change to arms, bushings, or camber hardware alters the alignment, so budget for a four-wheel alignment after the install.
Will these parts fit a lowered car?
That's exactly what the adjustable pieces are for. Toe arms and eccentric-bushing control arms give the alignment shop the range to bring a lowered car back into spec — check the listing for your chassis.
Is a tune required after suspension bushing upgrades?
No. Bushings and alignment hardware don't affect the engine, so no tune is needed.
