ZZP midpipe/2nd cat-delete with stock catback

[Rockcrusher]

How restrictive is the factory catback? I'm considering running a ZZP midpipe and 2nd cat delete pipe in conjunction with the factory catback. From what I've read its fairly quiet but with more turbo noise. I don't want to kill any performance gains if necking down to the factory system is too restrictive however.

 

[barch88]

You won't really see any performance until you do a turbo back anyways


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[rdss]

From what I've read on here the cat back gives a minimal gain on the hp levels we are seeing from the 1.4. Most of the gains coming from the exhaust come from a down pipe and high flow cat or cat delete test pipe. I think MPFab has dyno data to support this as well. A bigger exhaust will just give you improved sound until we start seeing turbo swaps and built motors but doesn't have an adverse performance effect either.