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I am FBO and just did this. It's so much smoother than with just the jb4. I'm hitting 17psi on map2 and it feels just like stock except I look down and I'm going twice as fast as I thoguht. I'm going to get on a dyno soon and see the difference.
I'm sure there's a more technical answer about what it does but based on the smoothness, I'm sure it's much healthier for the car as well vs just using a jb4 map 2 or 5.
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