Test Pipes will cause the light to come on and there will be not much you can do to not prevent the light coming on with those. With HFCs though you have a chance of preventing it with the methods above. Also less rasp, less smell with HFCs.
Not sure why Stillen (maybe due to lack of experience as they don't specialize in ecu tuning) keeps saying the o2's behind the cats that do the fuel adjustments when it's the front o2's that do the fuel/air adjustments as they need a reading before they hit the cats. UPREV has already disabled these o2s on several cars with no issues.
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SOLD: 2007 NISMO 350Z #0044 Silver Alloy
New DD: 2010 Titan Pro4X CC
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