just got my jeep back and seems as though the GSM heads work very well. I can't wait for the supercharger and headers!

Question: Is it possible that the gas mileage has gotten noticeably better? I am averaging about one mile per gallon more on the highway according to the trip computer. Could this just be the computer getting used to the change????

I'm not sure of the answer to your question, however I would like to be the first to respond. Good work!!! That thing should be Bad! I spoke to the guy's over there, and they said about 50hp with just the heads and intake. Good luck...

where do you see the biggest improvement with the heads?? 0-60 or all throughout the power band? Can you actually feel the power increase? What did it cost you for the install?

Good question. I would say more on the high end. It just seems to respond much better. the install was about 1200.