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Downpipe restricts the turbo the most, also not sure how trifecta does things, but the DP will cause an engine light to come on unless the tune is adjusted for it.....also get ready for a VERY VERY much louder cruze....as I have this exact setup.
 

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The primary cat is more restrictive so doing the DP is a good start in modding the exhaust. Not sure why they're saying very very loud cruze with just adding the DP because mine has a subtle prr with a now noticeable turbo spool and blow off. I also have a k&n cai that compliments it well.
Saying very loud because OP already has muffler and resonator deleted as well, which I also have with a catless downpipe, and it is very loud.
 
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