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Discussion Starter · #1 ·
what benefits would i gain if i bore out the intake/exhaust ports on a used head. i found plenty of 2.1 heads at a local yard and dont mind getting my dremmel tool out. also what could i do with the intake manifold? i have a 91 900 non turbo with a 2.1 head . it has a mss header/mss rebuilt exhaust/straight thur cat/bored out throttle body/and k&n air intake with ram air thanks for advice
 
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