I have been wondering what the various exhaust systems do. It is easy to buy into the ad hype and hope they do what they say.
To make a long story short , I ended up trying aStock system, Pro Circuit pipe, an FMF Gnarly, and an FMF fatty on my YZ 250.
The differences between all the pipes are very slight. The Pro Circuit and stock systems fit really well. The fmf pipes do not fit quite as well.
I wish I could tell you the performance differences, but there is nothing worth mentioning. The gnarly MIGHT have a tiny bit more low end, but not 199.00 dollars worth.
I setteled on the gnarly pipe because it is the easiest puipe to deal with. Some of the others did not gie enough clearance around th eoil filler hole. As you know, the 1997 YZ's had the filler cap designed by someone with a serious drug/alcohol problem.
My honest opinion is to save your money until the stock pipe gets smashed. Then buy whatever aftermarket pipe is cheaper.
None of them change power characteristics as much as a flywheel weight kit.
To make a long story short , I ended up trying aStock system, Pro Circuit pipe, an FMF Gnarly, and an FMF fatty on my YZ 250.
The differences between all the pipes are very slight. The Pro Circuit and stock systems fit really well. The fmf pipes do not fit quite as well.
I wish I could tell you the performance differences, but there is nothing worth mentioning. The gnarly MIGHT have a tiny bit more low end, but not 199.00 dollars worth.
I setteled on the gnarly pipe because it is the easiest puipe to deal with. Some of the others did not gie enough clearance around th eoil filler hole. As you know, the 1997 YZ's had the filler cap designed by someone with a serious drug/alcohol problem.
My honest opinion is to save your money until the stock pipe gets smashed. Then buy whatever aftermarket pipe is cheaper.
None of them change power characteristics as much as a flywheel weight kit.