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Message: <blockquote data-quote="donCityZ" data-source="post: 2301352" data-attributes="member: 22885"><p>i think for summary, if u want to maintain low end torque, IMO:</p><p></p><p>low cc: 1.6 and below: use s-flow with stock diameter.</p><p>higher cc: 1.8-2.2: use straight flow with stock diameter.</p><p>turbocharged: straight flow with larger diameter.</p><p></p><p>if u only care about HP (ie maintain higher top speed), then can follow this general rule:</p><p>low cc: 1.6 and below: use straight flow with stock diameter.</p><p>higher cc: 1.8-2.2: use straight flow with slightly bigger diameter.</p><p>turbocharged: straight flow with much larger diameter.</p><p></p><p>this summary is base on my experience and friends's experience. for comparison:</p><p>my car is using stock muffler, stock piping diameter, intake mode, 4-2-1 xtractor, 1.5 AT. my fren car is using straight flow, stock piping diameter, intake mode, 4-2-1 xtractor 1.6MT. at low speed (0-100km/h drag), we do all-out, i still can match his acceleration. weight is similar. </p><p></p><p>and i also test drove my fren car before and after he change to straight flow.. his low end torque suffers greatly till he need to taper the midbox bullet.. and still cannot get back the stock condition low end torque.</p><p></p><p>my 2 sen nia.</p></blockquote><p></p>

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