Turbos spool slower on a dyno, thats why the number seems higher than usual. You probably don't have to O-ring it, if you aren't going for crazy high race gas boost numbers, plus nitrous on top of it. Just try to get a good seal on that headgasket. If you are just going to run an AFC, get a socketed EPROM ECU so that some changes can made to the top few rows of the stock timing map.
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