I would like to hear everybody's opinion on which exhaust system is the best 4 a yamaha grizzly 660. I ride a lot of parks and goverment owned land so I would need to have a pipe with a spark arrestor. I have been looking at a supertrapp IDSX but I am not sure.

 

A few weeks ago, I was looking for a new exhaust system for my grizzly, and ended up getting the Pro Circut T4. Wicked response time, with amazing gains in the low end. the only down fall to it all was the amount of noise. The stock system from the factory read about 82db, and with the T4 system I'm running about 139db. To put this in persective, a jet engine is 170db. You can buy a noise reducer, wich will side right inside for clean looks, but it will set you back about $500.00cdn. Hope this info helps.

Bryan

 

HMF, a slipon will run you 200 bucks from sweetquads. I love the hmf on my rappy, its a great performing and looking pipe, the sound is awesome and you can't beat the price..

 

Heres a link to the site, looks like you'll get some nice big HP gains.

http://www.hmfengineering.com/yamgriz.html

3-5 hp throughout the rev range.