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The JB4 and FI axle back is 42/72.

So, just to be absolutely clear, FI is claiming 14/34 horsepower on a stock engine with just the axle back?

For those of you that have had the opportunity to own both, is there a huge difference in ride quality between C and D load tires?

Borla provide any dyno data on HP gains with their climber systems?

Looking at a set of wheels that only come in 17x8.0 instead of 17x8.5, and just wanted to make sure that the width will be ok on a Bronco, and that I won't have an issue with tire fitment in the future. In particular, a 37x12.50.