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The only thing I can think of it pulling or ecu out and looking in it to see if there's a chip or a sticker saying something about high performance? If that gives you nothing? Maybe break down and have it dyno'd ?
I've got a 42DD/Blueflame set-up, and spike at over 20 sometimes; my N-valve just kinda quits for a sec, then brings me back down to 14...I can't wait to get tuned and get a MBC
are you holding 16? I spike 16-18 psi all the time but it drops back down to the 14 area. That is normal, its based off of load and if you are going on a slight incline...