Originally Posted by Spec R
well the real cat is back on and the top end surge and raspy exhaust tone is gone, but some low-end torque and mid-range is welcome return.
Right on! :goodjob: When/ if you get to building the car for major FI or nitrous, I'd again look into a high-flow cat. But I'm glad to see you've switched back.
[BTW, my earlier comment was aimed toward others who probably haven't experienced really bad pollution first-hand.]