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Give it some time, the headers on my last car took a few trips to settle down. Now I'm not saying it will sound a lot better in your particular case, but in mine they sounded totally different after 50 miles.
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08 GT500 Coupe | Vapor Silver/Black Stripe | Build Date 02/15/08
#4628 of 6513 Coupes | #706 of 971 Vapor 
FRPP Handling Kit, FRPP CAI, FRPP KR Axle Back, Steeda Adj UCA, Steeda LCA's, Evo Adj Panhard, Smoked Signals
06 CBR600F4i | Candy Blue/Black
Micron High Mount, Smoked DB Windscreen
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