I had the TNT F1 kit on an auto 2002 Z-28 with a 222-226 566-569 spec'd cam and stock heads. On motor, the car did 371rwhp and 369 rwt. On bottle (100 pills), the best the car did was 503 rwhp and 574 lbs of torque at 11:1 a/f. You do the math. We had to modify the lid slightly and it didn't fit 100%, but the kit was clean, the car ran great, and you could NOT believe how hard the hit was. The kit comes with everything you need, and the placement of the ring is far superior than that of the MAF kit. TNT also has quality. The ring is metallic, as opposed to the NX plastic "insert." I have yet to see horsepower gains like that of TNT. Also see the other topic about being "fed up with NX" in this forum. I know that Real Performance Motorsports took of their TNT kit to test the NX MAF ends kit, and they lost power on 150 pills. But anyways, you really could not be happier with the whole TNT set up along with the actual kit itself. The ONLY TNT add on that is not recommended, is their bottle heater. It claims that it is self regulated, but many times I would check bottle pressure and it was almost 500 psi over the thermostat that I set(almost 1500 psi).