Will I need to re-tune with a new exhaust?
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Ronald..
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Will I need to re-tune with a new exhaust?
I just had my car tuned a month or so ago so I'm not in any sort of rush to do it again. I have a Borla catback on and it should be a full 3 inch turbo back. There is a presilencer in there and I think that is preventing some flaming. I am looking for a more aggresive cat back. Would I need to re-tune for this?
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It depends on what ECU or piggy back you're running, what you power level is, and how restrictive your old exhaust was. There are too many variables for someone to say for sure. I would say at the very least you need to have it checked.
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Your microtech will be tuned for your current setup and any changes to the car, like exhaust, may have an effect on the way the engine runs. Sounds like you have a nice setup and I think playing russian roulette with the car would be risky. Get it checked and re-tuned as necessary.
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Smoke moar
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If the pre-silencer is preventing flames then it is probably restrictive. Opening up the exhaust can cause the car to run leaner than intended. There are too many variables to say what it will do for sure which is why it needs to be checked and re-tuned as necessary.
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If you have a wideband, I'd replace the exhaust and see what kind of a difference it makes. If nothing changes, or get .1 leaner or richer, I probably wouldn't worry about it. If you go from running 12:1 to 15:1, I'd probably worry about it.
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