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RonnieSan said:
So I don't get it. Do I have too much back pressure or too little? The thing with my "Aero Turbine" muffler is that it creates a suction so it's actually pulling air out of the exhaust.
That's if you believe the marketing hype. It sounds like a crock to me.

AUTOBOT said:
A little geometry (rounding numbers to the nearest 100th)
2.25" pipe has an area of 15.9"
Two 1.75" pipes have a combined area of 19.23"
Two 1.5" pipes have a combined area of 14.13"
The formula for area of a circle is pi x the RADIUS squared, not the DIAMETER. Ergo:

A 2.25" pipe has an area of 3.97 sq/in.
Two 1.75" pipes have a combined area of 4.81 sq/in.
Two 1.5" pipes have a combined area of 3.53 sq/in.
Two 1.625" (1 5/8") pipes have a combined area of 4.15 sq/in, which is the closest match to the single 2.25" pipe.
 
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