Hey everyone,

I'm new to the scene. I just aquired a 03 Cobra a couple months ago and I'm trying to get as much HP and torque out of the bolt on mods without having to crack open the engine. Just currently trying to get the most potential out of the car, for the smallest investment. I've been researching, and I would appreciate any advice anyone can give me on the best products. I've just added K&N CAI, other than that it's all stock. I don't plan to race the car, but more to just have fun in it, and perhaps appropriately represent the mustang nation on the street.

Any suggestions are greatly appreciated.

I was wondering if anyone had info or suggestions on
1. 2.8" vs 2.75" vs 2.93" pulleys (alluminum vs steel) and (quick change vs standard) along with tensioner puller and shorter belt.
2. Brisk Premimum Spark Plugs
3. Mobil 1 Synthetic vs Redline vs Royal Purple etc..
4. Diablo Programmer Tuner vs others