After months of R&D our first batch of test pipes are now finally available!
As many of you know that the main restriction in the E9x M3 exhaust is the primary cat. The ACM test pipes are designed to replace the primary cat with perfectly mandrel bent, top qualy pipe which retains OEM o2 sensor bung locations and bolt directly to OEM exhaust manifolds. The rear section of our pipes can either be clamped or welded on for a factory-like fit.
*ECU software or module is required to keep the check engine light off.
** These are for off-road use only as deleting catalyst is not legal in all 50 states.
MSRP: $425
Intro price first 30 sets: $379 
For max horsepower gains, pair with an ESS e-flash tune!
Combo Price MSRP: $1,420
Intro Price: $1,279
PM us for an install or shipping quote!