i would say more then 10%, you will definitely need a tune. I can tune you up in Reno, We charge $400 for a basic stage 2 setup.
The intakes on the newer models is wayyyy different then older years. adding an intake will make it run very very lean under boost conditions.
I have seen a few people do that and not tune the intake well leaving it very lean under boost but ok under cruise condition's.
you can call me or txt at 775-750-6838
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MAYHEM TUNING
2006 CGM STI
570WHP
539WTQ
10.6 At 136MPH Sacramento
Last edited by renosubby; 2013-04-09 at 09:39 PM.
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