Subaru Impreza GC8 & RS Forum & Community: - View Single Post - 25DB Widebody Rsti
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Old 07-10-2014, 09:07 AM  
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STI manifold has a small volume plenum due to the intercooler siting right on top of it. Thus limiting the hp @ high rpm.

Also having the long runners gets rid of tgvs.

Originally Posted by salvi View Post
Why was the RS intake manifold use instead of STI?
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