straight pipe
#3
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#5
definitley won't hurt. i have it done to my 03 right now. i just took the cat and muffler out moved all the pipe forward and modified it a little with welding to get it past the cab and did a turndown behind it. sounds AWESOME on just a 3 1/2 inch pipe. turns alot of heads and am always getting complements wherever i go.
#10