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Message: <blockquote data-quote="ABV9750" data-source="post: 1145199" data-attributes="member: 9375">the pop pop sound is actually incomplete combustion that is suppose to end at the mid section.this is how the mid section position/size is very important.sometimes you can see a few car with mode exhaust has a flame at exhaust tip.this is the same scenario.the different is the incomplete combustion is too huge and create flame.truely to said.they lost power due to not enought exhaust piping size and length.in your case, the mid section is not in correct position or size compare to the exhaust output.if you wanna settle this quit, just change to bigger mid.prefered oval cause it's good in noise reduction.professional N/A tuner normally will trial and error by just install a straight pipe and check the flame ending.then they measure it and install the mid section at flame ending so that the exhaust resonance end up there and create a vacuum at the backside.the wavelength are vary depends on engine output.sometimes it takes a day or more to identified the end flame.worst case of wrong exhaust selection will create a backpressure.this will absolutely add friction to exhaust flow.most of our mechanics not knowing this.they're now just selling product rather than consult the best option for us.better buy the recommended aftermarket whole set exhaust that has proven good exhaust flow rather that mix combination.go to exss or powerzone or din ejos(ulu klang) to get good advise.</blockquote>

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