[Cam install, what can I expect]

2003 Silverado SS

Truck is stock except a CAI, TrailBlazer SS intake manifold and BBK shorty headers. I am planning to install a stage 2 BTR cam and get a tune done in a month or so. I am hoping to gain 50hp, without losing much down low as it does see some miles towing the trailer. Best bang for the ??

[Gas Octane?]

I’ve had three of them and have logged close to 400,000 kms on them. First one I ran premium,but when oil hit $140/bbl,I switched to regular. Trucks seemed to run a the same on regular, don’t notice a difference in power and maybe 1mpg on the highway. 

[Just bought a 5000lb trailer for my ‘03 to tow]

Long time lurker, first post. I’m looking to get a little more grunt out of the engine without breaking the bank. Truck pulls the trailer great but could use a little help when climbing hills. Here is what I’m thinking: air intake, BTR Torque cam, Shorty headers (keep costs down) and a tune. I live in Canada and a set of long tubes and Y-pipes is $2500 plus install, more than I’m wanting to spend. The BTR cam is getting 20ft-lbs more torque at 2500 RPM out of a 5.3L engine and 50+ HP at 5000 RPM, but I’m more interested in the low RPM torque gains. Thoughts/advice?