Help a newb out, please...

Ok guys I have a 96 Cobra, when i bought it already had many goodies, but the stock mid pipe rattled like crazy. But before I got a new mid pipe I got a set of Summitt Glasspack mufflers Y I have no idea but it sounded pretty good with the stock mid pipe. Well this weekend my Mac - O/R h-pipe gets in and I'm pumped to install it, do (PITA) and finish. I do a start up test (small leak where the pipes comes together clamp it no biggie) but when I go to drive it sounds HORABLE like a 72 ford truck with no muffler and a farmer behind the wheel wow 7 Hours of work so it sounds like **** anyways the exhaust is dumped before the rear axle (looks cleaner) and the car is WAY too loud and sounds like ASS at low RPM's its the worst, anyways I figured its the redneck mufflers so will replacing them with say 2 chamber Flowmaster 40's. My ? is will it make it sound GOOD with a TUNNED exhaust note? Thanks for any help or comments welcome thanks guys me now.

any with the Mac O/R-Flowmaster 40's combo very welcome.

I know bro but I need a quick fix and I know everyone and their mother has a Flowmaster brand exhaust or catback its just that I cant wait another week.

Really I wish I had the $ for a Bassani, I think we all know about Flowmaster quality but now I just need it to sound good. We F-Body guys know about Flows so we dont use them at all on our cars we usually run Borla what I have on my SS or SLP, Magna, LT w/true duals, ect...