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RoadsterSport Helmholtz Exhausts!

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  1. California Delete

    Exhaust
    A friend of mine just picked up a 1999 California car. It's now throwing a code suggesting the front catalytic converter is toast. We are up in Canada and (obviously) not subject to the California CARB stuff - how do we go about deleting all of it so that the car becomes a non-CARB spec? What...

  2. Raceland header gasket

    Exhaust
    What gasket do I use between the header and cat back? The stock exhaust has that ring gasket and the header does not it leaks really bad

  3. 1.6 Exhaust manifold

    Exhaust
    Hi guys Are there any differences between different 1.6 NA exhaust manifolds? Ie are all manifolds (OEM, JDM, etc) made of the same metal and do they all have the same bore size? I plan on grinding/ removing the internal welds to increase flow. Let me break down the question...

  5. Exhaust size

    Exhaust
    Hi guys. Does anyone know or have a formula for calculating the optimum exhaust size? I’m talking exhaust I.D Power gained and just the right back pressure. (There are arguments on whether back pressure is good or bad also) What size ID against the amount of horse power you’re chucking...

  6. Replace or reuse old exhaust manifold studs?

    Exhaust
    Should these studs be cleaned and reused, or replaced? If replaced, which do you guys recommend?
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Good-Win Racing
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