Patrick Garvan Posted January 9, 2008 Report Share Posted January 9, 2008 I am looking at getting a new exhaust system going up to a larger size. I have been running a full 3" from turbo all the way back without a Cat, but I have decided to get a removable high flow Cat that I can use on the street, but change out for a straight pipe for the track. What I'm wondering is how much difference can I expect in a/f's and Egt's etc? I realize that this is way to open a question but at a guess is this something I would need to dyno test and make a different map for, or could I just play with the a/f's and watch the egt's? To explain a little further. I currently am running a MAF with chips and piggyback. I can also use an SMT6 to tune the a/f's and timing. Once I get my new motor later in the year I will be using the G3+. Any advice is welcome. Quote Link to comment Share on other sites More sharing options...
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