07/02/2026
Live on our site! Another drop from the KDM Tuners team. As we push these cars to the limit chasing FWD track records, we find the fail points, the weak points, and the areas where there’s lap time left on the table. The rear trailing arm is one of those areas.
The OEM trailing arm is a one-piece stamped steel part, built with a ton of flex by design — that flex gives the average driver comfort and a bit of predictability on the street. On track, those same traits work against you. Under load, the flex lets your toe and camber move around depending on how the car is positioned and how hard it’s being pushed. When you’ve spent real time dialing in your alignment, having toe and camber constantly shifting mid-corner is the last thing you want.
That’s where our Track Pro Trailing Arms come in. Designed in CAD and built from 4130 chromoly, these arms are engineered for almost zero twist under load. After several revisions and a lot of track testing, we landed on a design that gives the driver noticeably more feedback from the rear of the car — and in some cases dropped our lap times by half a second. That might not sound like much, but when you’re hunting fractions of a second, it’s a huge deal.
