hey man....i have that same set-up and the sound is killer. it has a more raw and powerful sound than a flowmaster..but it still has that chambered muffler tone..you did the smart thing by getting the h-pipe too b/c when i got mine i got an x-pipe and it is really raspy..it sounds ok on the outside but opn the inside it sounds likeit has a nasty exhaust leak. the h-pipe has a more deep powerful tone. congrats on the purchase.
I've got the exact same setup on my GT. It sounds AWESOME. I had my brother barrel down the road in my car and I couldn't believe how awesome it sounded. If you trust someone with your car have them fly by at 5K RPM - it's awesome
It may be alittle differerent sounding for me because I've got the mach1 motor - but it shouldn't be much different.
I spent a total of $700 for both H pipe and cat-back exhaust installed.. I haven't paid for them yet, but the general public thinks it sounds the best and gets some of the best gains for the price..