Hey J, pass on it bro. I have one, a stage 1, in my 98 ZJ now and its invisible when driving. It needs 92 octane to work correctly and even still all I ever really noticed was the rpms go higher, a delay in shifting. Not worth the $$ IMO.
Though what mod I did to my I6 that I did notice was changing the plug wires to a low impedence better wire and the intake air filter and changing the muffler. Those mods will make a difference!
So skip on the chip..waste of money.