i have a 91 z28 350 tpi.ive heard about gutting the air box.can anyone tell me how this is done and how much you would benifit from it.pictures or instructions would be great

 

Air intake box is comprised of two parts, upper and lower. See separate parts in link below. If you remove lower part from car, you can see a baffle system that prevents water entering air filters. I used a regular wood ripsaw to get my baffles off.

There is a thread around here that somebody flow tested air lids stock and also gutted. Gutted flowed 50 cfm more for a 10% flow increase over stock. I did it to mine (bought a junkyard unit to save original). Car feels a little more responsive with the throttle. I think it is worth it.

http://www.mifbody.com/vbulletin/sho...-N-Air-Filters

 

thats good to know.thanks for the info

 

I did this a few weeks ago. I was going to do that "Ram Air" thing but was having a rough time finding the ducting. I read about just removing the bottom of the box on a Corvette website and decided to give that a whirl.

I just marked where I wanted it cut, and then used the Dremel to cut out the bottoms and then ground the goof ups down and smoothed it all out. Was pretty easy.

I noticed that over 45-50+ I accelerated much better than before so I was happy with it. Under those speeds I didn't notice anything. Passing on the highway is a bit better now as well.