Understanding that running san-air filters in general is risky.

Is there any reason why running the stock airbox (cover on and not gutted) without an air filter ,or bare a TB for that matter, is any worse (debris induction wise) than running ITBs without filters?

Just a after beer, but before bedtime random thought...

 

people run ITBs without filters but that is far away from the intake location compare to the air box, I personally would not risk it. Obviously it will be a decent increase in airflow. That is why race cars dont use them, they definitely rob horsepower. How much is the question.

If you are going to use the stock air box, I would just as soon run an open TB and put a filter on the breather that runs into the stock intake hose.

 

I believe a filter has more air flow because of more surface space of a whole filter that induces air compared to just the intake opening.

 

Tried this on my short commute to work today just for S&Gs.
Butt dyno says there was increase in throttle response and no dicernable increase in acceleration. Only a mild intake noise increase was detected.
This particular dyno isn't know to be accurate at all though...

 

There are plenty of IBS systems that draw from a plenum that IS filtered. The only guys who run unfiltered intake systems are guys at the track, cruisers who put very few miles on their cars and only in the best of conditions, and people who don't care what kind of grit gets squeezed between their rings and the cylinder walls.