Nice looking ZJ DPoV. My tech knowledge of ZJs is limited but do you have the e-fan as well as the fan clutch setup on your 4.0? Wondering if you have tried to running without the fan clutch and just the e-fan and see if you can increase the efficiency of the grille block some more. I'm sure you've noticed that the stock turbine can easily blow a cat off the ground when locked up. So by blocking off the grille your clutch might be locking up a bit more potentially converting any gains into the extra power required to turn it?
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