check youtube.
i will say this about the combo... my friend had an 01 GT with stock exhaust manifolds, an o/r h-pipe and the am-thun flowmasters, and it sounded awesome.
when i bought my car, the first thing i bought was the american thunder flows, it was WAY to quiet for my liking with stock manifolds and stock mid-pipe.
6 weeks later, I bought a set of
bbk ceramic coated l/t's (from that same friend who ended up selling his car after he got out of the air force) and installed them with a bbk o/r x-pipe... it sounded BA, except for the rpm between 2500 and 32oo rpm... it was WAY to raspy... it sounded like it had an exhaust leak...
I ended up putting an o/r bbk h-pipe on instead of the x-pipe and it sounded amazing. no more popping and snapping. i mean it really sounded good... however, it still had that hollow sound of flows with a lot of drone around 2k and 2.5k rpm. It sounded good, but the same as almost every mustang around...
In the end, I have BBK ceramic coated L/T's, a BBK Catted X-Pipe, and Magnapacks. Its a different sound... it is loud but sounds good.
I ran the magnapacks with bbk lt's and the bbk o/r h and it sounded like a dump truck. That might be because i have a KB with 9+ psi at low rpm and the cylinder pressure may make the magnapacks sound like crap. The bbk catted x-pipe makes it sound amazing. Just my 2 cents. Again, check youtube.
