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I am running a stock HG @ 26 psi on my 50 trim for about a year in a half, so might as well dispell that HG "need" in that list, also my wife has been running her 60 trim at 20 psi for about 6 months now too with a stock HG.
Like most have already said...
-fuel pump..walbro 190
-injectors..atleast 650s or larger
-Engine management/fuel controller (tons of different combos here won't even go into it)
-ARP head studs (have heard of people eclisping 30 psi on stock head bolts...but I wouldn't reccomend it)
-FMIC (I don't think the sidemout is up to the task)
-logger (IMO definately a must if you are going to boost that high)
Just for reference mid 20s on 93 pump is going to be tough. Car is going to have to be tuned well. My engine has a bit higher compression than yours (9:1 vs 8.5:1).... but I could not run more than 21 PSI on pump gas without knocking like crazy. 20-21 psi about 7-10 counts was about it for me at 14-15 degrees of timing. Until I got methanol injection. ;-)
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