So, I take it this is pretty stock with 400 hp? Really a stock system would be fine.But a 2 1/5 would be all you will need with an H pipe.I have a 528 with a 2 1/5 stock system with resonators, and it is good enough for the street. The mufflers are Hemi mufflers that flow better than stock.
Have you ever ran your car without the current system with no other changes?
The reason I ask is that I didn't "feel" the .9 ET and 8 MPH increase in my old Dart by removing the exhaust system and I have a ton of time in race cars
That car weighed around 3500 Lbs. with me in it so do the Google on how much HP that old stock stroke stock bore 440 motor made, it was not a rocket ship even back then
