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The J/A is a modified 10 mod. It changes the pressure of the HP oil system. It also has a shifting full power defueling setting and a high exhaust temp defueling setting. On my 7.3, there is a true 75 hp increase. Also has an exhaust temp gauge and boost gauge.
You will need gauges with the EVO. It is a program and because it tinkers with the program of the engine, it can advance the injection timing, amount of fuel and who knows what else they change. Because of the number of things it can change, it will produce more power.
My personal feeling is that you will like the J/A with the safety of the defueling settings if you are looking for a modest power increase. Drag racing, go with the EVO.
Jim
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2001, F250 4x4, CC, Auto; Mobil 1 in transfer case&Trans.; Frantz Bypass Filter; "Hutch" fuel mods; Sonnax/Tricum mod; 4" Exhaust, 30" MagnaFlow; Attitude in A-Pillar and tranny gauge in Dash; AIS; EASE Diagnostics; Reese Slider Hitch; Fr Rotors, Cryo Treated&Slotted by ART.
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