Add resonators after the over axle pipe. Maybe Rich189 can post pics of his system. It's a very nice setup and I think he and change the config and sound easily.
I run the Mufflex 4" W/spintech single out. Like JS already said any muffler will take away some HP, but the big mufflex is heavy! I think the weight may have a bit to do with robing power as well!
I've heard the 3.5" with the dual outs and it sounds great on an LS1 car. The spintech is quieter down in the lower RPMs and far deeper then the loud mouth, but it the upper RPMs the system is still fairly loud!
Just beware that the Mufflex system is not cheap. If you get it you are far better off having them install it. It's a tight fit and having them custom fit it there will save you allot of headaces with clearance. Also the 3.5" fits a bit better then the 4" with the 4" you may need to to buy a Panhard rod relocation kit from BMR. And if you car is lower the over the axle tube can be real tight too..
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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