3" dynomax offset straight through box mufflers, then 2.5 out the back of the car. I feel it works well for my application, 428 with a hot 'stock' CJ cam in a 64 galaxie, to 5800 RPM max. Not too loud, very soft on cruise which i like, no boom or flowie echo to burst your head, but a bit of rumble at idle and some good bark on top when the 2x4 opens up.
Helps cut the noise with the downsizing, but because it is after the large column of air spring inside the dual three inch pipes and mufflers, back pressure is still low.
|This message has been edited by TorinoBP88 on May 18, 2017 9:02 PM|