Im planning on making quite a few phone calls friday morning and find out what companies are developing exhaust for the Predator. If available, Im gonna ask them to pass along actual dyno sheets to me. Ill let you know what I find out.
I bought my predator about a month ago from Cycle Town South. They installed the Pure Polaris muffler made by White Brothers. They said that it made a noticable improvement on two previous quads they had sold. This info is confirmed by a test in Dirt Wheels last month with a Rath Racing? Predator. They claimed a 6hp boost, (if you can believe Dirt Wheels). The tip configuration in the article is different from the muffler they sold me. The dealer also told me that White Bros is selling a headpipe which will make an even bigger difference but will require re-jetting. I didn't ride a quad without the slip on muffler, but mine runs great with it.
HMF out of Ohio said they tried creating a header and were unable to create any more horsepower with there headers over the factory headers. The guy there told me they tried 3 different designs. Right know there just suggesting a slip on with a 155 jet. They actually had advertised a full system but for right now reconsidered. www.hmfengineering.com
Trinity Racing makes outstanding products. I only speak from 2-stroke experience. If the header and silencer they have developed for the Predator is anything like their 2-stroke header and silencers then i may switch from the White Bros. to the Trinity exhaust. Also, i noticed on Rocky Mountain ATV site they have a Big Gun full exhaust for sale. Not sure about this product. I am a new 4-stroke ATV owner so i am not familiar with all the products yet.
You can make the W/B pipe real quite if you put in the quite core, and it can be loud, it is an all around good pipe, you can really tell the difference, and Gary at the superbike shop said he will be making a head pipe sometime to go with the W/B pipe.
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