turbodog Posted July 2, 2012 Share Posted July 2, 2012 Can someone please offer a convincing technical explaination of why you would need a tune when installing an aftermarket downpipe. From what i have seen personally, the only difference is that reduced backpressure may result in difficulty with boost control, which can be fixed without a tune. I read for a while and ol / cl delay was mentioned. Please advise. Link to comment Share on other sites More sharing options...
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