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Originally Posted by 04 3.9 Mustang
I have a 2004 3.9 and want to know how much intercooled supercharged PSI the motor can take? Engine condition is like new but about 17,000 miles on the ticker. Also I'll be using a Eaton M90. Would 38# injectors work or should I go with 42#? and who in colorado can tune the computer to work with these mods?
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This might be conservative to some but I wouldnt go over 8psi on a stock motor. Not sure about a tuner in Col.