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Old 01-11-2013, 11:03 AM   #4
Slo86GT
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Join Date: Aug 2011
Fan#: 88885
Location: Hockley, TX
What I Drive: 2013 Sterling Gray Focus SE

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Soooo if a 5.0L pushrod made 225hp from the factory with 2.25" dual pipes... Why does it gain power moving to a 2.5" system? I daresay that a 2.0L making 160hp from the factory is moving much more air volume than that weezy 2.5L per bank engine.

I honestly don't give much credit to the backpressure theories on modern cars where multiple cats are retained. The cats are a blockage, and force backpressure to be retained for the engine side of things, cancelling out most if not all pulsation in the exhaust flow, and anything post-cat system is made better by open pipes.
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