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How much should a good metal head gasket run, installed?
The HKS ones are about US$350-550, but that's just parts.
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machining will probably be a few hundred bux, then you've gotta deal with the rip down and tear apart of your engine.. could run over a grand fairly easy, unless you want to try to do it yourself. you should get ARP head bolts at the same time to keep the head tightened down, then you can run higher boost without fearing a BHG.
this's how id go about doing the mods in order..
1) HKS MHG / Arp Bolts
2) 3" catback & Downpipe
3) K&N FIPK
4) boost controller (running 11psi)
5) boost / EGT Gauges
6) decent lowering springs and struts, specially if you plan to put on bigger wheels.
you really dont need the BOV.. thats just for fun, id spend the money on other stuff first.
PS -- ive heard of people just ripping the top off of stock BOV's that dont vent to the atmosphere, would this work in a supra? this guy with a DSM did it and i guess it was loud as hell!