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#2: 11-18-2011, 05:03 PM
 
 robitrice
Title: Senior Monkey
Location: North Central MA
Car: Driveway Ornament
Posts: 1,811
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exhaust section has your answers if searched....ill give a brief explanation.

Cat back system vary....youtube is your friend for how it sounds.
Any DP with a proper tune will let you pass emmissions when plugged into the diagnostics as longs the codes are off and no CEL. If you have a strict visual garage you wont pass with any mods

Catback have minimal gains, stock is good for 300awhp. Headers not really worth it for a DD.