Hi I have a 98 Silverado with a 350 Vortec. What minor mods would boost hp, torque, and effeciency? I have a K/N air filter and duals(factory cats with duel 50 series df). Would putting a higher output coil be that noticable power difference? I'm not trying to get a quater of a second better in a quarter or anything, I just want some minor streetable power. I know easy hp is kind of an oxymoron, but any suggestions. Other than running nitrous, headers, swaping cams, porting heads or electric fans. Cheaper than a $300 mass air flow sensor. Any help or suggestions would be greatly appreciated.