The BORLA? 140645BC is a Cat-Back? exhaust system for the Chevrolet Colorado and GMC Canyon trucks. The exhaust system is a direct bolt-on part for ease of installation. Specifically tuned for the 3.6L engine, our S-Type Cat-Back? delivers a sportier sound and a more exciting driving experience without any drone. It features a 4" T-304 stainless steel Black Chrome exhaust tip. Using BORLA? Stainless Steel Polish p# 21461 is NOT recommended with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth. Bright Chrome is also available (PN 140645). For vehicles with Crew Cab and Long Bed 140.5" Wheelbase, add Extenstion Pipe 60570.