Need exhaust help

Just an FYI, going to 3" will quiet it down all by itself.

My engine made more power and ran better with the 3". My engine makes 315hp/450tq at the wheels. Clearly not very radical. goes 11.70's in street trim.

I had 3" on my last Dart, 340 410HP...... That thing was so loud, always had cops bothering me (got a noise fine) and the drone was horid