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Cutout boost creep?

1K views 0 replies 1 participant last post by  vegaspsyco 
#1 ·
Would a cutout downpipe create boost creep on a EJ25? I would assume so because a downpipe without a cat causes it.
Does EM stop creep? or would some other part stop it?

I saw this question asked in an old thread but didn't see the answer.
 
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