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Working with quite a few cars of late so ;)

An increased number of JASMA approved catbacks have a reducer pipe inside to make it comply to the JASMA level [90dB, 96dB or 98dB]. So while the tip maybe say 120mm, the reducer inside actually...

On the subject of gain or loss? This is in NO relation to Dandy, I'm located in Sydney so I don't know them, just some theory...

When you hear stories of losses with bolt ons... Its usually...

Straight pipe can be talking about the design shape of the piping's path, the straighter the piping, the more efficient the exhaust is. Straight pipe can be also referring to a catback that has no...