tuckaloe said:The deal with pipe length is *greatly* mitigated by having the correct pipe diameter. 2" vs 2.25" may be significant in this case. The smaller diameter will keep air velocities up, have less volume to pressurize and be generally more responsive. And if Corky Bell says 2" is adequate, us plebes should at least ask ourselves why he feels this way since his tremendously experienced engineering expertise seems to be saying that more is not necessary. Unless of course it's the only way to get it all to fit. But that seems unlikely, no?
I didnt know they specified that it was going to be 2in piping. The reason I was figuring 2.25 is because my buddy knows a lot about Ko4 tuning with his Audi A4, he has done a lot of research and we were talking about it and figuring that would be sufficent. Im no expert nor claiming to be, I was posting what had an idea of. The Main thing though for pressure drop and length is the diameter of the piping like you said. The piping really isnt that long, if you look at wrxs I believe their route is even longer... Heres a pic of it. All it comes down to is having the right size piping, the route could vary slightly but all in all its a matter of what you will be happy with.
Pic of fmic piping on wrx, dosent look any shorter than my idea, actually longer...

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