They're functionally worthless. Save your $, spend it elsewhere.
Also, as I've mentioned in the past, the search button can add up to 20 WHP- I KNOW this topic has been covered SEVERAL times in the past, on this, and every other Wrangler forum- try it out Mark W.
that would be "Wheel Horse Power, sometimes you'll see RWHP for Rear Wheel Horse Power" that's the power you are actually putting to the ground after parasitic loss due to trans, transfer, rearends etc. For instance your "Engine" HP may be 150hp but dyno'd at the wheel it may only show 115hp for a loss of 35hp thru the drive train. That's why wheel measured HP is more accurate or realistic as it shows what you are pushing your vehicle with. Hope it helps.
'11 Mango Tango Rubicon Unlimited
09 Sunburst Orange JK Unlimited X aka Sunny = Traded-in
'82 CJ-7 = SOLD (WHY WHY WHY)
BUT I CAN'T BE OVERDRAWN...I STILL HAVE CHECKS!!