BMW 640i Gran Coupe Original Exhaust 640 m-sport

Engine and Performance

BMW 640i Gran Coupe Original Exhaust 640 m-sport

aycy

3,000 RPM
Senior Member
Sep 6, 2006
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Hey guys, i hav just install a twin barrel mikuni carburator in my wira 4g15...the throttle respond seems even worse than my stock carburator le...haih...the secondery only open after 3k while throttle more than 2/1...below 3k rpm i tekan habis the secondery also wont open..haiz..issit normal? top speed decrease, from 185 to 165km/h.........one thing really disapoint me is, all my friend said that my car has less pick up....even when the secondery open, the pull of the engine also has no...
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