Has anyone tried a Flowmaster 70 with a SI/SO catback setup? I'm looking for a little extra power with a interior noise level only slightly greater than stock. Any feedback would be appreciated.

 

I have been running the 70 series for a year or so and am very satisfied. I just did muffler only as I have a 4.6 and a 2 1/2" pipe is plenty big enough. Got a slight performance increase, no noise at idle nor at cruise, no drone ever. But, you can tell it is there during acceleration, nice deep rumble.

------------------
98 Nascar Edition, Superchip, Airaid, Flowmaster 70 series, bedliner, in bed tool box, Profile bug deflector and window vents, Class III receiver hitch.