STI 3 head porting, benefits for 450*450 ?
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From: Api 500+bhp MD321T @91dB Probably SN's longest owner of an Impreza Turbo
STI 3 head porting, benefits for 450*450 ?
Im looking into having some sti heads ported/flowed. Is there a great benefit in performance weighed against cost of having it done?
