Does anyone know if you can tune for headers and cold air intake with this? Also has anybody been able to gain decent hp with this?

 

Appears from the part # that you are looking at a Hypertech Power Programmer III for a 1995 LT1 engine. As noted in another post, you need to use the "Signature" field to provide info about your car, so people can help you.

You can not tune for headers or CAI with the Hypertech. You can do things like change the rev limiter, speed limiter, shift points, gear ratio, tire diameter, fan on/off temps, etc. But the only way to alter the program that controls the engine's performance is to load the "canned" Hypertech "power program". In general, this program does virtually nothing, and has been shown in dyno tests to reduce HP, when you don't use the Hypertech 160* thermostat and alter the fan on/off temps.

You can get a mail order tune for way less than the cost of the Hypertech, and you will see 10-15HP on a stock engine. You really don't need to reprogram for headers and a CAI.