Quote:
Originally Posted by diss7
Removing a cat is not what we're talking about.
You don't want any restriction for peak power, this is why high HP cars have as little exhaust as possible. But back pressue helps spool turbos. When you're talking high HP, using a smaller exhaust to create back pressure to generate spool sooner will act as a massive restriction on peak power.
This is not the case for this setup.
Edit - Prove to me with dyno graphs showing the same car running the same turbo setup, the only difference being a bigger exhuast, that shows the larger exhaust helps spool. Until then I still call BS.
Is a 2.5" system going to be a significant restriction on this kit? No its not. So, use it, as the smaller piping will create more back pressure to help the turbo spool sooner.
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Its 2013... The backpressure theory has been debunked. In no way shape or form is back pressure beneficial to FI. In most cases back pressure isn't even useful in NA applications.
I gained 400 rpm of spool upgrading from 2.5" to 3" piping on my Mr2 turbo and had
HP gains everywhere.