Our GT and Fastback pipes are made to fit either a right-side drive or a left-side drive configuration. The diameter start at 1.75” and ends at 2.25” with a Big Bear Chopper logo laser printed. All pipes are premium chrome plated with ceramic coating on the inside to keep the chrome from discoloring from heat (some discoloration may still occur). O2 censor bungs are welded in the back of each pipe for your EFI system. If you are running an EFI system, you will need an aftermarket ECU unit with the proper mapping. Talk to your dealer about availability.