Quote:
Originally Posted by bellabimmer
those bangs in gearshift do they happen just with exhaust upgrade or secondary downpipe is a must can somebody tell me ?
I have X5M EU version so soon I will install exhaust without OPF so I am interested to know this info.
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Remember I installed the catback exhaust system and used it for 3-4 weeks before adding the catless secondary downpipes. Your hear the pops on up shifts WITHOUT the downpipes, but with the downpipes they become way more prominent, much louder and crisper (if that makes any sense).