Well they carry no warranty on the bolt-on part of course...however I just don't want to add a CAI, then have something happen to the engine and have them blame it on the CAI in some way shape or form. Plus on my old Sunfire I had something somehow get past the filter and into a cylinder (small near-microscopic rock or something)...long story short needed a new engine.
Also I didn't really mean autocross (Accord is a little big imo for that)...but more lap time on track days (so where you get to run a few laps of the entire actual track on a raceway). I know people who have done it, but its like $150 or more to run, plus the cost of replacing your tires, brake pads, brake rotors, oil change (to play it safe), among other things.
I'll probably still go some day...but my baby's too young still (hasn't even reached her second oil change...lol).