Our 4" version is now fully tested on the street.. After a DE, 4,500 street miles (and a lot at low speeds and in traffic with the A/C and head lights on) and coming within 1/2 of 1 MPH from a Land Speed Record the unit has proven it's self.
I've seen a minimum of 5HP gain (at the rear wheels) with this unit along with LOWER coolant and power steering fluid temps. One engine has seen 8 HP, but it was one of my high revving 3.2>>3.6 modified engines.
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