Not true for a ported motor. My 830 ran 159HP without the airbox and only 154HP with it on (after rejetting to lean it out). I am running the airbox, but added a snorkel from the box up to where the temp gauge mounts using a 2" SLP prefilter on the pod.
I'll post some pics in a few days.
Don't run the TPI's or SLP filters on the box where they draw in hot air from under the hood.
K&n's, tip lowboys whatever u use will suck in warm air from the engine, but that doesnt mean u dont have to use them, the tpi valves will give u 3 extra hp on top end thats the only point in time where whatever you use, it will not suck in warm air cause u have a constant flow of air coming underneath your hood, i have them on my 500ss and i noticed alittle more top end mph.
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