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stage one is just an ecu upgrade, stage 2 comes with the airfilter and catback exhaust, stage 3 comes with a downpipe... thats about the only differences i know.......i think they r the same programs for each stage, just more parts
 

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I've always thought it to be:
Stage 1-drop in filter
stage 2- drop in and cat-back
stage 3- drop in- catback and downpipe
 

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trexturk has it right, stage 2 is just from the catback and stage 3 is full 3inch exhaust with a 3 inch dp
 
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