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Old 01-18-2013, 12:12 PM   #44
xluben
Scooby Guru
Member Sales Rating: (17)
 
Member#: 261612
Join Date: Oct 2010
Location: Minneapolis, MN
Vehicle:
2002 WRX - 750WHP
9.5s @ 150mph

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Yes, the GReddy does neck down a bit. The 80mm piping makes it looks even more drastic. On the smaller piping of the GReddy SP Elite you can barely even notice it necks down. The small mufflers seem like they'd flow well, but they are quite loud.

I'm very interested as to how much the extra bends hurt flow in practical application. My thought would be that the muffler would have a much larger effect. Almost to make the bends negligible. I could be very wrong about this though.

This could especially be an issue with many of the exhausts that have a larger muffler with a side entry. They have a 90 and then a 180 going into the muffler and then 90's out each side! This really can't be good for flow.

How much time are you spending on they dyno? For completeness I think it would be great to also have a stock exhaust and one of the N1 styles, but maybe that's too much. If you did want an N1 style, there are some real cheap ones out there too:

http://www.erzperformance.com/TSUDO-...-p/20-9365.htm
http://www.cntracing.com/CNT-perform.../dp-08subs.htm

My other thought was a center exit. Would this benefit at all (slightly less of a bend)? If you're not really focusing on looks then you could just cut a hole in the diffuser (rally style) or have a turn down and dump it just below the bumper.
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