Yeah, you're going to overboost with a 3" exhaust on a Mitsu turbo. I haven't had to deal with one yet, so someone else should chime in to help you eliminate it. It's just that its a really small turbo and opening the exhaust like that really reduces its spool time, plus the wastegate isn't big enough to control it with the 3"
You could put a zenor diod in mapsensor. Better yet go with a 3-bar cal and all nessacary componets. That way you won't smoke the engine. I run fwd's stage five cal on my 89csx. Ran 12.923 with a best speed of 113 last summer at bir. That was on bfg drag radials and 2.2 60ft times 20#s of boost on stock block.
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