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					Originally Posted by Dean  The biggest obstruction is probably the diameter change at the rear axle and the muffler.
 A straight pipe on an 05 will be hella noisy. I'd at least put some sort of muffler at the back.
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 I don't think he means a full straight pipe all the way to the end, just a straight (non-resonated) midpipe from DP to axleback.  
But yeah, it'll still result in a noise increase, even with the same axleback on there, and probably won't gain much.