hfc and test pipes
hfc still has a cat so still mostly legal and cleans the air somewhat.
test pipe is just a straight pipe with no resriction on exhaust flow more hp but illegal and not environment friendly.
test pipe is just a straight pipe with no resriction on exhaust flow more hp but illegal and not environment friendly.
And while we're giving tuning tips, unless you're running turbos, SOME restriction is good (increases torque). Don't buy into the whole peak HP argument, but rather, look at power increases in the everyday powerband ranges.
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magnetism80
G35 Coupe V35 2003 - 07
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Jan 27, 2016 12:57 PM




