Does anyone know how much horse power this quad has? Stock and Modified?

 

About 27 at the rear wheels when stock.

CT makes a kit they say will give about 38 and a race kit that will do about 45. There are various others out there as well....

 

Mr. Air,
Gabes right. I've got a full race CT440. CT said it produces @45hp and I believe them. It easily outran a DS 650 with a Woods pipe in a 1/8 mile sand drag. Curtis Sparks now has stroker engines that displace 465 and 480. I would have to think 60hp is a pretty conservative [g]estimate on those engines performance.