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I found a stock exhaust and put it on. Then I heard the exhaust leak I had missed. So on monday as I drove around the car actually felt really weak. It struggles to get up hills and no improvement on mpg's, maybe a little less if anything. I'm guessing it because of the leak. On tuesday I put the 2.25" exhaust back on and the car is back to running normal. I did notice that if I use 89 octane instead of 87 the fuel economy goes up from 31mpg to 33mpg. I know the EX motors have a slight increase in compression. So has anybody else experienced this or any ideas on whats going on
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