Which SLP cat-backs???
, or swap back to the stock stuff for inspection.I guess another option would be to keep the car regestered out of state.....
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D/D is a stainless steel, full muffler catback that flows extremely well for being so quiet.
Rumbler is an entery level catback that cures the Rasp problem of the Loudmouth by having a bullet style muffler in the I-pipe instead of a resonator.
Long story short, both are catbacks. D/D is quieter than a Rumbler. D/D costs more and won't rust. Rumbler is pretty cheap and sounds good.
Sound is very subjective, so visit ls1sounds.com

. Loudmouth flow very well though.get the dual/dual for flow and sound
http://www.texas-speed.com/shop/item...d=195&catid=46





