I got a viair 400c a couple of years ago. It got use 3-4 times to fillup 33" tires. I went to a much larger tires and know that it won't keep up. I also have the gauge and pressure switch for it. This is the link for all the info. I know guys that use these to do onboard air and run they're arb's off of. Works great. http://www.viaircorp.com/400c.html they sell for $242.99 new I'll take $175 for it deliverd with gauge and pressure switch.