Why not try a truck glass pack. The size of the exhaust would be a big problim unless you have the equipment and skills to make a new exhaust pipe or can adapt the two sizes. Or do you plan on a butcher job? I ride motorcycle and know that a good exhaust system can start well over 500 hundred dollars and up. I also own two ATVs but never really looked into custom exhaust systems for them. I am sure you buy a custom system for your ATV. Check out E-Bay or some ATV catalogs. You can also install straight pipes and put baffles in them for some back presure. Just what do you own for a ATV?