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I've been reading the threads about the CAI in the 996. It seems the jury is out on any noticible performance inprovements, but most folks seem to like the improvement on the sound.

I have a friend w/a 993 who swears he got similar results by just drilling a whole upstream in his airbox.

My question is, can this be done with my '99 996? Would it affect any air flow sensors or is this just not a good idea?

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If you drill holes in the upper part of the air box, unfiltered air got free access to the MAF and the engine. In the bottom part is the sound effect practical nil. The best you can do is purchase a sport air box.

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