Beware of trainhorns.net i purchased the el diablo horn kit they say it is their best seller.purchased it Mar.5,2012,the compressor appeared to have been used. I installed the kit myself. I had to purchase an extra $120 in connectors and fittings to make it work.It worked for about three weeks and the compressor went out. I contacted trainhorns.net Mar.30,2012 the compressor supposely has a 3 year warranty and supposely is heavy duty.They said someone will help me and as of April 6,2012 i am still waiting on a new compressor.That is $450 i could of put to good use.
Yea lots of complaints about them
http://www.trainhornforums.com/showthread.php?t=3501
Should have ordered with hornblasters 
Welcome. It’s a shame you didn’t come here first because we could have warned you about them. Hornblasters stands behind their products and has great service.