silver04v
Well-Known Member
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Well, story goes, my 2013 si has 239k miles on it.. today it decided to end its life and my exhaust valve spring on cyl 4 broke and proceeded to jam that valve into the head...I'm not sure of piston damage yet, planning to boroscope it tomorrow. Say the bottom end looks good, what can I put on this thing for an upgrade? Can we swap on the head that has full exhaust ports if we make a custom header? What is involved with that and what would be needed.. also up for any other recommendations. I'm having trouble finding anything definitive.