well the vec 2 is a must for tuning, on a stock truck they are rich on bottom end, you should gain 60+hp on bottom and about 5hp on top. But it gives you adjustablility for constant upgrades. Long tubes are from $1800 to $3000 give best torque and hp, shorties are$800 or so I think but give reasonable hp. Magnalfow and borla make great cat backs. If you are looking for bling bling get the hennessy cold air, but the kn works great and womsteer has a group buy going on.Some of the best gains have been coming from getting rid of or replacing the cats with high flows. Boomer would be a great person to contact on the exhaust, Roe racing on the vec 2. So figuring starting at 420rwhp,10hp for cold air, 15 for cat back, 5hp on top vec2, 35hp for headers, and being realistic 15hp for the cats, one should or could end up around the 480-500rwhp mark. Now these are just averages, but with just simple modifications, the truck will be greater fun than it allready is. MOFO also can get a full system, and Bill P. can also help on headers, as well as John H. Good luck and welcome.