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Message: <blockquote data-quote="Malakian" data-source="post: 2570251" data-attributes="member: 57580">Hello. I'm using Wira Sedan manual 1.5 injection without engine modification.Recently, i had upgraded my exhaust system. The modifications are:1. 4-2-1 Extractor2. Exhaust pipe 2" with bullet - According to the mechanic, the size is 2". (Manufactured for wira 1.5 with headers).3. JamSpeed Twin-Tip S-Flow MufflerI'm a little worried that you all said that the maximum exhaust pipe for 1.3-1.5 Wira is 1.78". What should I do? My fuel consumption is improving, and top-speed is increasing. Before changing the piping, I already installed 4-2-1 extractor, and when I change the exhaust pipe to 2" i've noticed that the car is much 'lighter' when i press the as pedal. Or is it just psychological effect?On the other hand, i've noticed a 'preng' sound when i rev the car coming out from the muffler. Is it caused by stronger exhaust gas due to larger exhaust piping? What should i do? Should i installed another bullet with the existing bullet or discard the existing bullet and replace it with a new bullet that can absorb the 'preng' sound? What kind of bullet should i use? Normal bullet or spiral bullet? What is the advantage of spiral bullet? I'm still keeping the standard exhaust pipe with me.Thanks.</blockquote>

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