cutout vs longtubes
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No, the biggest cork in the flow of the engine is the manifolds. The stock units will only allow so much air through, with LT's you get more flow, and a better chance to scavage air and push through the stock muffler.
A Cat out is used to circumvent the Muffler, like I said 2 different things.\
Depending on cat back choice, you may or may not need to put a cut out on.



Doing longtubes OFTEN need the pcm tune adjusted.
I had a SLP lid, Dynatech headers WITH cats and a Corsa. I was running lean and running 6 deg of knock retard.
A Cat out is used to circumvent the Muffler, like I said 2 different things.\
Depending on cat back choice, you may or may not need to put a cut out on.
at the same time ?,....explain..this is why is asked if i can get the same results with a cutout its what i want.










