2010 Aftermarket Exhaust System Talk. PC, FMF,

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Yosh did good things for the 09/10 CRF450 and I'm hoping for the same results on my Yamaha. The slip on is actually slightly heavier than stock (less than 2 oz.). The RS4 has a very clean look and it's more than 3 inches shorter than stock. I don't like long mufflers because the more that sticks out the more likely you are to bend stuff when you crash. That's another thing I didn't like about pre 2009 YZ450s. Anyway, I'm expecting more top and overrev.

That looks sweet. Have another pic from the inside? I'm still waiting for their full system as I'm in no rush with winter here and not being able to ride untill late april anyway but their slipon should perform well with its resi chamber before the main silencer.

Didn't bother to read through all these posts, but you guys seem obsessed with buying aftermarket exhausts for a bike you may not have even ridden yet. I have 20 hours on my 2010, and the motor is even more outstanding than the better handling chassis. This coming from a rider that just got off an '06 model 450 yammie. One is always welcome to spend an extra 5-800$ on a flashy aftemarket exhaust that produces 1.3 or so extra ponies at a different RPM, but Jeez, probablly less than 2% of us can handle the beautiful power that comes OEM....this motor is amazing....spend the extra money on a membership at your local "Pure Fatness" health club, the return will be infinitely more rewarding.... :ride:

Didn't bother to read through all these posts, but you guys seem obsessed with buying aftermarket exhausts for a bike you may not have even ridden yet. I have 20 hours on my 2010, and the motor is even more outstanding than the better handling chassis. This coming from a rider that just got off an '06 model 450 yammie. One is always welcome to spend an extra 5-800$ on a flashy aftemarket exhaust that produces 1.3 or so extra ponies at a different RPM, but Jeez, probablly less than 2% of us can handle the beautiful power that comes OEM....this motor is amazing....spend the extra money on a membership at your local "Pure Fatness" health club, the return will be infinitely more rewarding.... :lol:

From every test I have read it says the bike is lacking top end pull/over rev. IE signs off fast. Just think its an area for improvement and am looking for an exhaust system to improve upon that, but I see where you are comming from. You're right, some people's money would be better spent at a gym, but myself personally dont need a gym membership. I have equipment at home and keep up on my fitness and have disposible income that allows me to buy an exhaust to improve on the bikes power delivery, while also looking better to boot!:ride:

Didn't bother to read through all these posts, but you guys seem obsessed with buying aftermarket exhausts for a bike you may not have even ridden yet. I have 20 hours on my 2010, and the motor is even more outstanding than the better handling chassis. This coming from a rider that just got off an '06 model 450 yammie. One is always welcome to spend an extra 5-800$ on a flashy aftemarket exhaust that produces 1.3 or so extra ponies at a different RPM, but Jeez, probablly less than 2% of us can handle the beautiful power that comes OEM....this motor is amazing....spend the extra money on a membership at your local "Pure Fatness" health club, the return will be infinitely more rewarding.... :lol:

it's a subjective topic . while you might think the stock engine is perfect others might not. my last bike was a 08 crf450. no nonsense just power from bottom to top and everywhere in between. i enjoy shifting when i want to not when the engine decides to stop pulling.

i paid $320 for the slip-on, and i workout 5 days per week. i know the benefits of being in shape and the benefits of an engine that lets you worry about obstacles not shifting. :ride:

That looks sweet. Have another pic from the inside? I'm still waiting for their full system as I'm in no rush with winter here and not being able to ride untill late april anyway but their slipon should perform well with its resi chamber before the main silencer.

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the Yosh sure is pretty , but that is asking alot of the thin cast mount at the end of the subframe , it really needs to mount up solid to the front subframe mount with more than that the finger coming off the rear mount IMO

Edited by DH367
I won't disagree with ya there but all a pipe is good for on a 450 is bling other than the 08,09's. The gains are rather small and most of the gains people are getting are prob from rejetting. If they simply rejetted they would probably gain almost the same amount as the stock system. I do agree there are power gains and all but I would be able to go faster by spending $600-1000 on suspension rather than exhaust.

that is not true , the dyno shows that the 2010 muffler is hurting power pretty bad ( it is robbing almost 2 hp peak and over 3 hp on overrev ), it is because it is designed to be quiet at 4500 rpm because that is the stupid way they like to check them at this time and they end up as loud as anything else at full throttle anyway , if you look down into the stock muffler you will see a big step where the core ends and the tip starts , this is to cause sound wave reversion at low rpm and it make the muffer very quiet at low rpm , the bad part is that it causes too much reversion back to the exhaust port at high rpm and hurts power

man, is that too much pipe for that bike or what? im trying to decide....

that is not true , the dyno shows that the 2010 muffler is hurting power pretty bad ( it is robbing almost 2 hp peak and over 3 hp on overrev ), it is because it is designed to be quiet at 4500 rpm because that is the stupid way they like to check them at this time and they end up as loud as anything else at full throttle anyway , if you look down into the stock muffler you will see a big step where the core ends and the tip starts , this is to cause sound wave reversion at low rpm and it make the muffer very quiet at low rpm , the bad part is that it causes too much reversion back to the exhaust port at high rpm and hurts power

Is the step the reason this pipe is lacking in the top end?

Aside from weight saving materials, what is the real difference between the stock muffler and popular aftermarket pipe such as the DRD?

Is the step the reason this pipe is lacking in the top end?

Aside from weight saving materials, what is the real difference between the stock muffler and popular aftermarket pipe such as the DRD?

the big square step down in dia. + the long length are the reason , I havent seen Doug's muffler but I would think it and other aftermarket mufflers are alot better perf. than the stocker

the big square step down in dia. + the long length are the reason , I havent seen Doug's muffler but I would think it and other aftermarket mufflers are alot better perf. than the stocker
I have seen the DRD, and while the actual outlet diameter is a little smaller than the core (which is not an uncommon layout, FMF often does this too), the step down is not as abrupt or as great as the stocker. I think you'll find that most exhausts built in the aftermarket will either be "straight through" or have a much smaller step than stock.

The most frequent comment following the installation of most of the pipes users have reported on follow a common pattern in that virtually all report improved pull up through peak. Dave has dyno results he generated by adding a more open muffler to the stock header/mid pipe that show the same sort of results. Forum rules prohibit him from discussing his products here, but if you contact him directly, you may find his stuff worth investigating. He has a number of satisfied customers among the membership here.

I agree Grayracer, I put the FMF full system on my 2010 and it mellowed it out but made it very very very useable. and it does pull harder on top! So far I like it!

the big square step down in dia. + the long length are the reason , I havent seen Doug's muffler but I would think it and other aftermarket mufflers are alot better perf. than the stocker

I just picked up my 2010 yz450 and I had a chance to ride it back to back with my freinds which has a Dr.D full system and I can say I was shocked how little difference there was between the two. The Dr.D did have a bit more upper mid to top end and was a little softer down low but the I wouldn't spend the money for that little bit of a difference. I've used Dougs pipes on all my yamaha 450's (3) and was very pleased with the performance but not so much with the 2010. We swapped several maps on his bike and mine still the differences were very small.

I have seen the DRD, and while the actual outlet diameter is a little smaller than the core (which is not an uncommon layout, FMF often does this too), the step down is not as abrupt or as great as the stocker. I think you'll find that most exhausts built in the aftermarket will either be "straight through" or have a much smaller step than stock.

good info :thumbsup: and I agree , the thing that really sucks is that a pipe that has less step and a larger opening will check louder using the current test method but is the same db at full throttle as the stocker , I have sound tested many pipes at full throttle to back up this statement , the pipes that are coming on these bikes are built around the SAE low RPM sound test , the things they do to lower the low RPM db level are not effective at high RPM , they only hurt performance , I pray that the AMA sets a full throttle db limit close to what a stock 450 puts out and starts testing at full throttle because there are alot of pipes that dont pass the low RPM test that arent any louder than the ones that do

I just picked up my 2010 yz450 and I had a chance to ride it back to back with my freinds which has a Dr.D full system and I can say I was shocked how little difference there was between the two. The Dr.D did have a bit more upper mid to top end and was a little softer down low but the I wouldn't spend the money for that little bit of a difference. I've used Dougs pipes on all my yamaha 450's (3) and was very pleased with the performance but not so much with the 2010. We swapped several maps on his bike and mine still the differences were very small.

is the DRD the straight one or the snail type? or was it a slipon ?

I agree Grayracer, I put the FMF full system on my 2010 and it mellowed it out but made it very very very useable. and it does pull harder on top! So far I like it!

sometimes a higher/broader power curve gives a mellow delivery but in reality it is moving the bike harder and faster :thumbsup:

I agree Grayracer, I put the FMF full system on my 2010 and it mellowed it out but made it very very very useable. and it does pull harder on top! So far I like it!

This is what I noticed also. sometimes you can get a pipe by a company and it does well but then you can go with a company that knows well.

I chose the FMF for the reason of that they have been in the business of pipe making for as long as I can remember.

when I bought this 2010 I wanted a pipe that I knew that would make a difference so I chose a FMF.

For anyone looking for a pipe for their bike ........ Go with FMF cause you just cant go wrong with them. They are even giving discounts on there pipes during this tough economy. See if any other pipe company is doing that for the people.

Hands down.....You just cant beat FMF. Hell of a company..... Hell of a company!

How much did you pay for your FMF, Cappy?

How much did you pay for your FMF, Cappy?

$494.99 for the full 4.1 titaninum system.

This is what I noticed also. sometimes you can get a pipe by a company and it does well but then you can go with a company that knows well.

I chose the FMF for the reason of that they have been in the business of pipe making for as long as I can remember.

when I bought this 2010 I wanted a pipe that I knew that would make a difference so I chose a FMF.

For anyone looking for a pipe for their bike ........ Go with FMF cause you just cant go wrong with them. They are even giving discounts on there pipes during this tough economy. See if any other pipe company is doing that for the people.

Hands down.....You just cant beat FMF. Hell of a company..... Hell of a company!

I have used alot of FMF stuff over the years and was happy with it , but I personaly think they are one of the ones that pushed 4 stroke exhaust prices through the roof and raked in the $ when times were good and the stuff was flying off the shelf , I think the real reason for the 20 off deal was to get the pipes flying off the shelf when things slowed down , if they wanted to help people they would have had more reasonable prices all along IMO , there are other pipe companys that have never had high prices , and I think Pro Circuit has the same 20 off deal , probably for the same reason IMO

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