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The JB4 is the most advanced and highly featured tuning system available for your B58 and B48 vehicle. Power gains are up to 60hp to the wheels (80hp crank) on a completely stock car on pump gas for a B58 and up to 40hp to the wheels (55hp crank) for a B48.

Save on BMW B38/B46/B48/B58 JB4 Tuner with a Burger Motorsports, LLC promo code

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