Tailgunner USA TU4FRC-2 15" Long Stealth Fighter - Pair Right The 15" long STEALTH FIGHTER pipe is an easy custom installation on most bikes. The STEALTH FIGHTER is the same as FIGHTER model but in all black. The STEALTH FIGHTER is our best selling universal fit muffler and is great for V-Twins as well as sport-bikes and customs. The 4" diameter canister is a universal fit muffler and will mate with any headpipe size using our adapters. (See adapters below) Just measure the outside diameter at the end of your exhaust pipe, (left to right outside measurement) where the FIGHTER inlet slips over the head pipe so you can order the correct adapter size if needed. (The STEALTH FIGHTER inlet is 2.5" / 63.5mm) The STEALTH FIGHTER is a very free flowing muffler. It does not contain a baffle and produces a deep, aggressive sound and great performance. Stock universal models have a 2.5" inlet size. Adapters are available and required for smaller exhaust pipe sizes. Right and left side orientation is determined by sitting on the motorcycle. Length / Diameter: 15.5" / 4"