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Hey everyone. I’ve got a 1.4t cruze with a ZZP catless downpipe, and muffler delete. I’m interested in getting a 2.5” downpipe back exhaust, but worried how it will run. Will it run correctly without a tune? Thanks.
 

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The exhaust isn't the real concern, running a different downpipe without a tune is pointless though. Yeah it might spool half a second quicker, but it still hits the same torque target and pulls boost out. Even worse it might just be messing with your fuel trims a bit and actually making the ECU compensate.
 

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The exhaust isn't the real concern, running a different downpipe without a tune is pointless though. Yeah it might spool half a second quicker, but it still hits the same torque target and pulls boost out. Even worse it might just be messing with your fuel trims a bit and actually making the ECU compensate.
This. If you're going cat-back a tune isn't needed. If you've got the downpipe and are going downpipe-back a tune is a must
 
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