RE: savage xl tuned pipe (dilemma)
The stock header is a silicone coupler. The Ofna pipe is a spring coupler. I have run them with the Ofna pipe and header, Tsais header, STS header, Hot Bodies Header, all to get different lengths. You can fine tune the engine by header length, basically it seems the shorter the header design, the higher up the rpm range the torque curve moves, a long header gives it more torque at a lower rpm. It is kind of cool to play with. Any of the spring style headers for a big block will work. I bought a whole series of headers from RC Hub just to play with the exhaust length. I have used them on several trucks since then and my variety pack has dwindled down. Bud