Quote:
Originally Posted by Moto-Mojo
Here is the Unicornish Republik we like to flash back to stock before a semi-annual smog check. Just in case the tune altered the air-fuel mix enough to bring Gollum and other Lords of the Realm down on us. One tuner said it’s not necessary and one said it might be. I kind of doubt that’s the reason in SD though.
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Reloading the stock tune with long tubes and not cats won't help him pass a smog check. I would guess he thinks that fuel mileage will be better with a stock tune and the modified will be a performance tune like some plug in tuners used to advertise.