Carb jetting with higher flow exhaust. Quick question.

[StangLX302]

I kinda new to this, so, forgive if this is a dumb question.

If I were to buy a higher flowing exhaust system would I want to:

A: Leave the jetting at it's factory setting.
B: Jet it up a few sizes.
C: Down jet a few sizes.

Thanks.

[200xman]

You would want a bigger main jet and probably raise the needle a notch or 2. The changes would be more drastic in a 2 stroke than a 4.

[TimSr]

You would want to change the pipe, then run it, monitor your plug, and then decided if a carburation changes are necessary. Depending on the pipe, you may have to change it up or down, and more than half the time, not at all.