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When I switchover to an aftermarket exhaust, I will be getting a tuner to turn off MDS. Its my understanding it makes performance exhausts sound ridiculous. My stupid question is this, Disabling the MDS ill affect my gas mileage how much? I need my muscle car sound, because my 64 Cutlass is being sold, I'm out of room for my man toys. PS Anyone interested in a 64 Cutlass convertible??:o
That's gonna vary a lot based on driving conditions and style. If MDS doesn't turn on often for you, you're not going to notice much of a change at all. But if it's on for 90% of your driving, you'll probably take a significant hit.
I'd say, get the programmer first since it's useful regardless of the exhaust. Disable MDS and drive around for a month or so to see how the gas mileage is really affected.
CT I have mine turned off & running with a 3" Flowmaster with 50 Series Cat Back. It is a mean sound so you will have your big block hot rod sound & my mileage is around 10.5 to 11. I do 90% City, little freeway driving. I also have a kinda heavy right foot as well.
Hope that helps with your question.