Subaru Enthusiasts Car Club of the Sierras - View Single Post - OEM catless vs. aftermarket up pipe DEBATE

Dean · 2010-03-10, 10:36 PM

The real first question is, what is the actual exhaust flow per cylinder at say 6000RPM at 20PSI boost at sea level at say 10:1 A/F?

After that you can evaluate the headers, crossover pipe and up-pipe.

Turbulence is bad, but in a pipe that flows 200% the required amount, it is not terribly significant. In a pipe that flows 90% the required amount, it can be a killer.

2010-03-10, 10:36 PM	#3
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	The real first question is, what is the actual exhaust flow per cylinder at say 6000RPM at 20PSI boost at sea level at say 10:1 A/F? After that you can evaluate the headers, crossover pipe and up-pipe. Turbulence is bad, but in a pipe that flows 200% the required amount, it is not terribly significant. In a pipe that flows 90% the required amount, it can be a killer. __________________ I am a Commodore PET --- Now get off my lawn you kids... Last edited by Dean; 2010-03-10 at 10:38 PM.