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      01-25-2013, 09:32 AM   #2
135Pats
The time has come.
 
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Drives: 135i
Join Date: May 2012
Location: Maryland

Posts: 5,578
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I have no idea what's wrong with your meth kit, without more detail it's tough to trouble shoot. Talk to Shiv he'll be the best resource for this. There are some folks with N54s running 20psi or so midrange, some also run aggressive tapers that hold boost pretty high towards redline. Anything over 20psi and I'd have to think you're leaving the efficiency range of our stock units. 17.3psi seems a bit low for FBO+meth, i'm currently topping out at 17psi or so midrange without catless downpipes or meth.
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