I have 4.10's in mine, made a big difference in take off and accelaration. On the hwy I can cruise about 80 MPH at just under 3000 RPM, but be kinda high for some, but I like it. Passing is awesome!! I just need to add some more spark via Xcal to get a little more ummmph, when I put the gears on I lost a little HP at take off, but I spoke to the guy who is letting me trade in my Xcal for Xcal 2 said he could take care of that for me. All in all, I really like them.
Yes, I had the A/F ratio changed to handle the problem runs like a champ now. Was it worth it, the tube itself is kinda pricey, but I picked up a few horses and a little torque. The sound on my car is really good, nice deep growl to it. I still have not convinced myself I need new headers, I have not seen if the JBA's are worth the price and I am not sure if the long tubes will be worth it as I am sticking with my single exhaust w/magnaflow axleback. Also, on the line of gears... the gas is just as good as before, about 250-260 a tank.
I am consistantly getting 20 MPG which is a combination of stop and go commuting driving and "drive it like I stole it" driving all the rest of the time. I can get 300 miles on tankfull but try not to let it get below half full.
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any v6 with pinion gears yet - 
