Tuning exhaust on 3.4 doch gtp

[pontiacgtp24]

I recently installed two 10' body 4'disc supertrapp mufflers on my stock 95 grand prix gtp.Each muffler has 8 plates installed and im not sure if thats enough.They were originally tuned for a large motorcycle. I thinking about putting 3 more plates in each muffler but will that be enough?Cat is gone(testpipe) but all other piping is original.adding some plates will add volume power but its just not the right tone. I've also been considering adding a single inlet dual outlet flowmaster,thinking i could use the small supertrapps as resinators after the muffler. Basically im looking for a deeper note out the back without sacraficing to much power.scince installing the trapps ive noticed a torque increase for sure and also a gallon or two better gas milage(20...ouch)

 

[Fivefingerdeathpunch]

mufflers dont add power.

 

[Slick2500]

Don't put flowmasters on a 3.4 its sounds to ricey.

 

[boostedcompg]

This is awsome...sub'd

 

[Z34Phoenix]

i used a single magnaflow under the car just after the cat. and ran 2.5" the rest of the way... worked great and sounded amazing.
Exhaust and Leaking valve seals - YouTube