I hollowed out my cat, (homemade test pipe!) & I think I lost a little low-end torque doin it. Anyone else have this goin on? It might just be my butt dyno actin’ up.
Ya I think i lost a little torque also by putting a test pipe on. but i gained it in the higher rpm. I also have a 4-1 one piece header which are supposed to be more of a rev header anyways. But ya let me know if you wrap your resonator with header wrap. i would like to know if it quiets it down.