The dual throttle body intake was a protype to see if the stock engine would use more air.
With the standard throttle (2) it was too much air for stock 4.0L.
With the smaller (2.5L) throttle body it made 22HP over stock WJ intake and 62mm throttle body, did have to use larger injectors.
Bottom line is the cost to gain 22HP was too much to sell for stock engines.
The COST for R&D and parts was $4500.00
To sell the intake and throttle bodys would be $1400.00 retail. I just though was too much.