Originally Posted by future370zzz

I recommend the impeller upgrade also. You will eventually want more out of the kit, might as well save time on the install and downtime on the car. Plus the bump in torque and HP through out the entire RPM band is not bad either.

I would tune it after install since the base Stillen tune will not give you much power and run rich likely. You can still break it in with a proper tune. Might as well save the 60 miles of gas on the tune as well.

My tuner dyno and road tuned my car extensively and did go through a whole tank of gas. I also told him to thorough run the kit for any problems since I didn't want to deal with them on the side of the road. He had to tune my AT line pressures as well so that increase the gas usage. If you're just doing dyno tuning, they probably won't go through a whole tank.