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To my knowledge, and that's almost NIL, when you do A/F mods to a motor you need to get the ecu custom remapped or you'll suffer in either low, mid, or high range (or all). Needs a dyno, a few runs and an experienced tuner able to read and remap A/F curves for your given set-up.
Just a guess mate
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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