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strange that supersprint reports 7 hp increase form the xpipe. I havent had the same experience with my own xpipe although there is def some drone around 2k rpm.
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2014 Porsche Cayenne Turbo S
2011 X5 5.0 Dinan - SOLD
2007 Imola Red Z4 M Coupe -SOLD
2004 Navy Blue BMW 325Ci |