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Message: [QUOTE="ultrasks700, post: 1294337, member: 20896"] When you pug in the tuner, you have the option to turn the EGR ON OR OFF, once its off you will lose the Check engine light. The x4 will come with 4 tunes: 50hp tow, 65hp tow, street, and performance. My go to is the 65hp tow, it shifts good, I get about 1.5 mpg better, little to no smoke, and power is significantly better. The next step up is the street tune, which has a lot more power, a little better fuel economy, but I feel it has "light switch" power, and the shifting is more harsh. Just my experience...the x4 is a great unit you should enjoy it [/QUOTE]

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