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Originally Posted by ecoli
If it still has the automatic ECU, then it is tuned for 390cc injectors. 450s aren't a huge jump so the O2 sensor can probably still handle it, but the jump to 550s might be too much.
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In closed loop the ecu can adjust for larger injectors up to 40% in 91+ and 30% in 90s IIRC but I am almost certain in dsms that when the ecu switches to open loop under hard throttle it is running off pre-programmed maps and the fuel trims do not update or have any affect on the fuel being injected. Correct me if I am wrough though, the dsm cd doesn't go into detail about it.