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really comes down to personal preference like stated. I think there is a night and day comparison and you don't relise it until its on your car and you hit the gas. I admit the stock exhaust has a nice tone, but no way does it compare to the DINAN or ACS or any high quality aftermarket option. Plus the added perfomance of air flow is a bonus as well. But to compare a stock to a modded exhaust there is no comparison to me... just my .02
much happier with the tone after addind the dinan exhaust
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-2010 X5 / / / M "Monte Carlo Blue"
-2004 X5 4.4i DINAN Stage II
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