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stock 3cyl is 1 3/8", so i believe the 4cyl would be no bigger than 1.5". If you're gonna go 2", you're gonna lose some low end torque, and gain a lot of noise at freeway speeds. But, the 4000+RPM range will be more powerful. Won't get any better gas mileage though. I would go with 1.5", maybe 1 3/4" at the biggest for a daily driver.
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