Quote:
Originally Posted by Nexx
The stock exhaust ID is 1.75". Most aftermarket exhaust will start at 60mm (2.36"). 60mm and 70mm (2.75") may be considered minute but in terms of how it will affect the velocity flow on a N/A K20 motor, I do not know.
I honestly think 2.5" is stretching it on a N/A stock cammed K20 because the DCRH collector is 50mm (1.97") compared to the Vibrant's and BCRH 2.5" yet the gains on the DCRH is just as good if not better on some dynos for a basic bolt-on K20.
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Im not a scientist so I dont know either. What I do know is, having a 3 inch piping or whatever on a n/a vehicle is terrible, its common physics. I also dont think the DC will outperform a vibrant or BC in anyway.