Quote:
Originally Posted by Nightbringer
I'm told the O2 spacers don't always resolve it permanently, but certainly better for the shortrun. With the addition of the header, I'd recommend contacting FA20Club for an actual tune. You'll see much bigger gains since you already have the header. Well worth the investment. 
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Unless he's going FI, it would be cheaper and more convenient to go with OpenflashTablet or BRZedit.