I just installed a Flowmaster cat in my truck. USA made. It has a stainless steel outer shell. $62 to my door. Go to www.holley.com, pick the cat you want, and order from Summit Racing.For those of us that are smog exempt, but want to run a cat anyway... Who has a good US made stainless steel cat that does it’s job without being extremely restrictive? And is cost effective? Or is that just a total unicorn?
I agree with this. One word for it is "savaging." Popular wisdom is to install 2.25" behind our trucks. I've often questioned that logic, and suggested 2" to try and hold onto some of the lower-end torque.FWIW You can go with too big of an exhaust tube and I suspect that stock to mild 22R/RE's may lose some low RPM power with a 2.25" exhaust.