I run Pypes race pro’s through a full 2.5” exhaust with 340 manifolds and run 11.39 at 117 mph. If you go Pypes, avoid the Violators. They sound HORRIBLE. Drove 1000 miles on Dragweek with the race pro’s. It was fine.
I run the Pypes race pros too and love them. Great sounds and I’ve been 5.98 in the 1/8 with them. I put a good dose of engine oil through them last year from in intake oil leak and took them off till I had the problem fixed. I sure hope I didn’t mess them up because I welded my whole exhaust system.