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a soild 20rwhp gain or more, + up to 2-3 mpg. the most worthy mod IMO
I agree with HP gain, but never seen the mileage gain like everyone claims. For example: I was getting roughly 16 -17mpg before my 93 tune and today I drove 200 miles on the highway at 65mph and got high 16.5 mpg. What gives? Maybe it's because I have 200k miles?