My uncle's old GSX had a cut out. it basically gets rid of the whole exhaust system and its restrictions with a click of a button. i thnk it has a flapp and it opens the cutout and closes the rest of the exhaust when engaged. and vise versa when its disengaged. its basically like running an open exhaust. cuz it comes right after the downpipe. I think its pretty cool if your set-up is for drag.. I dunt know why you would do it on a autocross car?
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