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Message: <blockquote data-quote="wirafly" data-source="post: 954033" data-attributes="member: 10859">last time after conversion my car running on 2" piping, center muffler and wira 1.8 rear muffler....then maybe I crazy or what I go and change to1.6" stainless steel pipingCenter bullet with twisted design (got hissing noise around 2500-3300rpm during hard throttle)Rear Super Turbo muffler (similar to MUGEN design)ResultLike totally no exhaust noise (silent then any factory standard car)Like no gas out.....kancil 660 more gas pressure feel from mufflerlow end slightly bettermid range stuck stucktop engine got but lesser compare to last setupFC.....if tekan .....teruk...no tekan slightly betterengine not so smoothwith 2" original mufflerexhaust noise normalgas out like normal carlow end so somid range smoothtop end lagi smoothFC.....so soengine smoothI plan to change my full exhaust system sooner, my plan1.7" white piping421 extractorcenter mufler with totally not barrier design, I dun like bullet hissing soundTwin tube muffler (my old stock)I found 4G91 not so suitable restrictive exhaust system......cause of the nature of the engine1. Short Stroke engine design (For mid to high end)2. Twin Cam.....for mid to high end design...3. 4 valve per cyclinder, for mid to high end design also...Think twice....I shud let the engine breath easily.....then only can release engine actual power, even my car auto...hehe....just my little opinion</blockquote>

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