Catless down pipe vs catted

[EddieNel]

I’m curious what the HP difference is between the 2 down pipes. Stock car with the 2 pipes what whp are they going to make with a tune. Stock exhaust. I’m reading an aftermarket exhaust is not going to help with the power this low.

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[Extreme Power House]

Same performance on stock turbo.
If you upgrade your turbo, you can make ~20 more whp with catless vs the high flow catted

 

[Meraki Autoworks]

Aftermarket exhaust will help even on stock turbos.
High flow cats have good flow, lot better than a stock DP so more power, but catless might make barely any more on a stock turbo than a HFC.

-Josh

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