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I figured it would be bad but i was not sure how bad. I had a mustang in the past that i ran un-tuned for weeks after doing a full exhaust/intake and it ran fine. After tuning i of course changed the oil, plugs and ran a can of seafoam through to "clean" things out. I guess these bikes are a little more sensitive?
Yeah, exhaust and intakes on a Mustang are no problem, and do not need tuning (unless that intake has a compressor on it). Most modern cars have Mass Air Flow sensors to meter the air and adjust for the increase in air flow. Motorcycles are a lot more sensitive to these mods. Exhaust is fine. Intake is okay. Both require fuel compensation such as a tune or FuelPak.
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