please don't feel bad asking questions,we all learn by asking questions..
1. check with Mike L from this site for cooling stuff for your tranny and engine..
2. a exhaust will help in mileage seeing with the stock exhaust you have a cat and muffler that takes some work to push exhaustes thru(another thing that you can do is make it into a straight using the stock piping).
3. yes a programmer helps quite bit but is important that you get the right tuning so i would go with the Diablo for the best price but the best is the PPE or EFILive..
on Edit: contact this guy also for cooling stuff for your duramax http://www.duramaxforum.com/forum/members/4382.html
__________________ James 
TyreBoyz Pulling Team
Pulling Truck called Late Nights
Puller/DD=04 LLY Reg Cab 2500HD,EFILive'd,Built Tranny and a fe fuel upgrades!
Business Truck
06 LBZ 2500 CC SB SRW,EFILive'd and a Built Tranny
DD/Beat Around
03 5.3L 1500 EC SB,Hypertech,Upgraded Tranny,Exhaust and CAI
Economy Saver
02 VW Jetta TDI,Stock for now but looking at a Chip,Nozzles and CAI!
tricycles = teaching childern from a early age that front wheel drive sucks 
Last edited by TYREBOYZ_DEMAXIN : 09-24-2007 at 09:03 AM.
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