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I've got the GMPP "off road" and its actually pretty aggressive. It's not overly loud but its got some bark to it. It might actually be too loud for my tastes when I add long tube headers. I'll have to wait and see.
I got lucky and got mine about a month ago and paid $724.00 total with shipping in handling.
I got it installed for $40.00 at a local exhaust shop.
So total investment with installation $764.00
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