Anyone have any first hand experience with these mufflers? I'm considering them. I'm about to install the TTI 2 1/2" exhaust system with X pipe. I was gonna stay with Flowmaster 40 mufflers (that's what's installed now) cuz I like the sound of them but supposedly they don't flow that well so thinking about something that will provide more performance.
Have a 70 Cuda with a 440 4 speed and the current dual exhaust system is only 2 1/4" with no H or X pipe.
So between uping the size from 2 1/4" to 2 1/2", adding the X pipe and using better flowing mufflers, I'm hoping for some HP gain.