Aluminum tuned pipe for T-Maxx®/ pipe hanger/ screws/ nuts (strong power across mid and upper RPM range) (blue-anodized). TRX 2.5, 2.5R, & 3.3 engines require pipe coupler (part 4941) to connect to stock rear exhaust header (header not included). Universal pipe hanger (part 4085) is recommended for cleaner installation.