I have my 2002 Silverado 2500HD 6.6L Diesel. It has 110000 miles and the only modification to the engine is the reusable K&N air filter and Banks Brakes installed.

I'm looking into a tuner, cold air intake and exhaust. I'm looking for any recommendations for all three.... Is there a good combination of brands that work well together?

I'm looking for something within a good budget and not the most expensive items on the market.

I also understand the LB7 engines have trouble with the stock injectors. Is it worth buying aftermarket injectors when the time comes?

Thanks and links would be amazing.