flowmaster american thunder ??

[silveradoreb]

Does anyone have this system on thier truck or has ne one heard it?  Does it use their 30 series muffler,

Thanks

[chevy4x4trucks]

I had it, I think it was a 40 series, sounded great, not too much cabin noise, but I did notice some backpressure loss so you loose a little low end.  I would think about going a different route, flowmaster seems to be great if you want loudness, but other not so loud systems won't cause a power loss.