Stay away from the Paxton/Aeromotive unit. Lots of folks have had problems with the bladders going bad in them. They may have fixed the problem in recent history, but I still don't trust them. I had the Paxton go bad in less than a year. Replaced it with a Kirban and its been good for three years now.
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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team