Sorry, I missed the most important part of your post: The BTG Dual that I have is a resonator type exhaust much like the glasspacks you are talking about. Two landmines to look out for:
1) Make sure that you get enough sound abatement..new laws going into effect across the nation on noise polution!
2) Resonance; at about 3000 rpm, noise is a real problem with some systems (sounds like a big bass drum inside the car).
Sorry about this number thing, I guess I'm making lists today.
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