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There's a lot of questions regarding the 200 pipes, silencers, whats best, whats the difference, etc, this thread will hopefully answer some of those question, and probably spur a lot more... A Bit of the difference in the models of 200's and difference in the pipes and carbs. 1998-1999 - These years used a different style of connecting the pipe to the exhaust port of the cylinder and are probably the most difficult to find. They used a 38mm carb for MXC and EXC versions. 2000-2005 - These bikes used the newer style 2 Viton O-Ring's to seal the pipe to the cylinder which gives you a very wide range of pipes you can choose from for tuning aspects. 2000-2005 bikes all used the same or very similar pipe (same shape) and they used a 38mm Carb. It's known that these model year 200's run a bit stronger than the 2006 and up model years that have a different pipe and carb setup. 2006-20XX- These bikes were equipped with a different shaped pipe as well as a 36mm carb. Many people say these motors are "smoother, torquier, etc" I think of it as slower.... but to each their own. The shape of the OEM KTM pipe from 2006 moving forward is very similar to the shape of the FMF Gnarly pipe, if you read many threads regarding owners from 2000-2005 who install a gnarly pipe one trend you tend to notice is that many of them complain about the loss of top end, it could be that the 38mm carb and the gnarly aren't as good of a combination as the 36mm carb and the gnarly??? I don't know. 2003-2004 SX - These bikes were equipped with an SX Style pipe that is shaped more like a 125 pipe where it exits the cylinder than all the other 200 pipes EXC,MXC,XC,XC-W that looks like a 250 when it exits the cylinder. These bikes were also equipped with a 39MM Carb. Pipes in the pictures below : 2000-2005 OEM Pipe (Aluminum Guard) - Below has the aluminum guard on it, the distinguishing features are on the stinger end of the pipe. Notice how the stinger is much longer than on the OEM 2006 Pipe that has the Carbon Guard on it. 2006+ OEM Pipe (Carbon Guard) - The stinger on the end of this pipe is very short, the overall shape is very similar to the FMF Gnarly. FMF Fatty (No Guard) - This pipe is shaped more like the 125 pipes, I use it on my 01 200 that is a hybrid of parts but basically an MXC, it's the most pipey but for an aggressive rider it's the fastest. Silencers Pictured Below: I bought each of these FMF silencers new and although Poldies donated this hockey stick to me (many thanks) I ran my original until I killed it. Long story short, I've put them all through the wringer. One Note First - If any of these mufflers are properly packed they are very quiet vs. virtually any other race bike, in the end, fresh packing is most important and two muffler standout in that regard OEM Hockey Stick - A damn good spark arrestor, it's easy to repack as the standard fmf packing fits perfect, its lightweight and out of the way. Turbine Core - Works like the hockey stick just a bit lighter, I think the quality of the aluminum on the Hockey stick is a bit better and resists corrosion better. FMF Q- It's the same shape as the Turbine Core just longer, it sticks out more and is more prone to damage, The picture of the end caps shows where I damaged it and the Q Stealth. These mufflers require a full FMF repacking kit plus an extra few inches which is a pain and made me less likely to want to repack it because it uses two kits instead of one. There may be a small performance difference with this muffler but it's not tremondous. The reason this pipe is more likely to sustain damage is because it goes straight up instead of making the final 45 degree turn that the OEM muffler does, hence why I damaged the tip. FMF Q Stealth - These things are GINORMIOUS, it's more how big around they are vs. length compared to the Q, it is not any quieter than the Q and I was overall very dissapointed. They don't claim these fit the 01 bikes but I had no problem bolting it on. This muffler suffers from the same problems as the Q, it sticks up higher than the fender instead of making a 45 degree turn like the OEM muffler does keeping it out of the way.