I'd have to say the mod I get the most out of is the exhaust. I love the cam and the converter as well as the gears, but most of that stuff only shows up big time at heavier acceleration. The exhaust is fun at idle, in traffic around town, and at full throttle. But the exhaust wouldn't be the same without the cam lope, so maybe cam + exhaust, for the sound it gives. The extra power is a nice bonus too.