Wow, Great response.
Thanks for all the feedback, you guys are great.
The changes I like to make, after reading all the responses.
1: do a Highway lean.
How to make this mod? this mod interest me the most, sounds like a fuel flow mod.
I have the stock fuel injection for this year truck, like to research more on the fuel injection system.
2: replace stock air filter with K&N OEM fit/on amazon for 69$
3: EGR delete.
I how do I update ECU as to avoid an engine light?
Is there a instructions on GMT400.com for that?
4: open the exhaust .
Not looking for a loud sound, so maybe a chamber type muffler.
And a cat delete/or high flow. will the cat removed throw an engine light?
5:change rear end lube to synthetic.
BTW, I have a 14 bolt/semi floating axle/from what i can find on the internet about this truck.
305/6 lug/C2500
How do I find out what gearing I have?
I do about 70 mph on the highway, am around 1800 rpm.
thanks
the Grip