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      10-19-2019, 08:43 PM   #33
zeyad.habeeb
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Drives: 435i GC
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Quote:
Originally Posted by alohasurftoad View Post
Quote:
Originally Posted by zeyad.habeeb View Post
Don't you need to tune it after putting the down pipe ?
both, fabspeed and cg precision ds-1, are high flow cats that do not trigger a cel, can run standalone without a tune and provide a decent gain.

flash tune and catted downpipe together will yield more gains.

of course, if you elect to go catless then you need the flash tune to clear the cel that will be triggered.
How much are they?

Will they void warranty?

Will it pass smog in CA?