I found the H (basicly the same as the Race) valve more agressive... the J i'm using now holds boost much longer (still peaks high... so i've had to Zener Clamp my MAP sensor to prevent soft limp mode)
yupp totaly. as i see it if my car does not like it i can always put it to one side and as im going to go bigger turbo or hybrid next year i can get the n75j mapped in with all the other parts .
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