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With the Jenvey BMW E30 M3 direct-to-head kit, we use butterfly throttle bodies compared to the stock BMW sliding throttle bodies. Butterfly throttle bodies tend to achieve a much better air/fuel mixture. Jenvey throttle bodies have a 52mm butterfly where BMW and other kits on the market use 48mm, meaning air can flow into the engine much more smoothly. The Jenvey linkage can be mounted front or rear, top or bottom. Available with or without a fuel rail. Tests showed an increase in 18-foot-pounds of midrange torque and 7 to 8 horsepower over stock M3 throttle bodies
