I just did the force II set-up for my 02, nice sound with the stock manifolds and cats, only slightly louder with the biggest difference on acceleration. Seems to me most cat-back systems don't add much in the way of power, but they improve the sound imeasurably over stock. If anything the flows were probably 1/2 the weight of the stock mufflers.
If your messing with ABS/TCS car watch out for the brake line on the passenger side (was a $180.00 fix at the dealer). I made the supreme effort to knock a pin hole in it.
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2002 5M GT (99% stock)
1991 5M LX (30% stock)
patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker
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