2.5 to 3.0 Exhaust

I’m right at 400 HP out of my current setup in my 340 in my 72 duster. Have TTI headers ( that don’t hit the ground) to 2.5 in with H pipe, to Moroso spiral flows and then over axle to rear exit under bumper. Car sounds great. Has a nice deep rumble, and once the motor starts spinning high, it’s like open headers. The nice thing about this setup, is you can talk inside the car with the windows down cruzing at 2800 and not be over ran by loud exhaust. I’m leaving it alone this winter when I pull the motor for YellowRose stage “crazy” ported Eddy RPM heads and airgap along with a cam swap. So long story short, best thing you could do is dump your mufflers for something with less packing and keep the money in your pocket from not buying 3in pipes and build yourself a “hot rod” motor.