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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Quick google search netted me this result -
http://www.dsmtuners.com/forums/turb...provement.html
Not a graph but it provides an outside source on how his power and spool time improved by going from a 2.5" to 3" exhaust.
I completely agree that a 2.5" is fine for this kit, thats not questionable. All im saying is that you DONT want backpressure with a turbo kit, and eventually 3" WILL be an improvement. The higher the HP the bigger the improvement. I mentioned the HFC due to the issue of restriction is results in terms of making power on a turbo application.