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 much increased.....haih any sifu over here who own a mikuni twin barrel, vacum operate secondery carburator can give me some advice? thanks alot wo..