[HUMMERcustoms.com/TAZ]

tomp hit the nail on the head about mapping. Also on the canned programers you have to do something else to get lowend.

Long tube headers as short will not help enough. Dual exaust true twin duals using Flowmaster my favorite. Dyanatech stainless catback header system tuned to work together.

Even better would be a good software tune to go with this instead of the canned tune. but, the canned tunes do work good with add-ons and don't forget the cold air intake also. All these together can get good performance. I was able to push my rig with canned tune to 400hp at the ground. Leave one out and you have weakened the end game.

Cleaning of throttle body is important as well as MAF wire that collects dirt.
If You look at it after each air filter change you will see which air filter is doing the best job. What ever passes through air filter shows up on the little wire. Be very careful cleaning this wire que-tips and alcohol. Shoot cleaner in throttle body with a high rev at small sprays as it will choke the engine down quick also use rag and clean intake of throttle body of the dirt that collects in front of butterfly and behind from poor air filtering mixed with some carbon. Spray cleaner on rag and just rub it off this makes sure you get proper idle and it not fluctuating on You. Plus if butterfly is not closing all the way then you will get false readings on other sensors as they are all tied together one way or another. Use some tank cleaner as there must be some help from it if nothing else cleaning the fuel lines and making fuel filter cleaner from deposit of petroleum in fuel, It has a tar substance that even though fitered out is still present and gums the fuel filter like it does the throttle body. It in thick enough form is a carmel crystalized looking stuff. If You ever bought and old motorcyle and fuel left in carb for long time you would have seen it. Use bottled heat to clean water out of tank. If you are not in habit of keeping a full tank in cold weather condensation will build up water in tank. Full tank each fillup will prevent this.

Well enough tips for the day. Bed time. Good luck.

TAZ