Best slip on for 09 yz450f?


24 replies to this topic
  • Drew22

Posted November 29, 2009 - 07:23 PM

#1

Ok hears the deal. I dont feel like spending a bunch of money for a complete exhaust system so i am looking for a slip on under $350. I want it to give me more power and to have a good sound since the exhaust on the 09 yz sounds a little sissy. How is the two bros m-7 slip on. Or does fmf make a good slip on. which brands will give me the most power and a loud sound. Also do I have to rejet my carb with a slip on or can i get away without jetting? thanks

  • FinchFan194

Posted November 29, 2009 - 10:13 PM

#2

I just bought a LeoVince off Ebay for $125. $150 shipped LeoVince has a huge reputation in Europe. The slipon came loaded with goodies, spark arrestor, quiet insert and wash plug. Here is a link to the store-http://cgi.ebay.com/ebaymotors/LeoVince-Exhaust-Yamaha-07-09-YZ-450-F-Leo-Vince_W0QQcmdZViewItemQQhashZitem3a5524ca8eQQitemZ250536577678QQptZMotorcyclesQ5fPartsQ5fAccessories

  • mxracer206

Posted November 30, 2009 - 05:03 AM

#3

Always had trouble with the two bro staying together, I know Pro-Circuit and FMF make slip-ons that are good. I have tried the Leo-Vince full system and it made great power but seemed really loud, the two bro is loud also.

  • Drew22

Posted November 30, 2009 - 12:20 PM

#4

Always had trouble with the two bro staying together, I know Pro-Circuit and FMF make slip-ons that are good. I have tried the Leo-Vince full system and it made great power but seemed really loud, the two bro is loud also.


which models by fmf and pro-circuit would give me the most power gains and a nice loud sound.

  • Greg_T_M

Posted November 30, 2009 - 01:18 PM

#5

I think the 08 and 09 run the same exhaust. I bought a slip on (FMF Q4) and did not notice much difference between it and stock. A week later I put the FMF Powerbomb header on and that made a huge difference. Maybe with the price break that FMF is offereing right now, you could come in for around $350 for a full system.

  • KJ790

Posted November 30, 2009 - 03:31 PM

#6

Of what FMF offers, the factory 4.1 performs the best. For Pro Circuit the T-4 or Ti-4 slip-ons would be the best performing. These two perform the same, but the Ti-4 is made out of titanium and the T-4 is stainless so it is cheaper.

  • nephic

Posted December 01, 2009 - 07:49 AM

#7

FMF factory, cheap cheap cheap right now.

  • tech24

Posted December 01, 2009 - 07:55 AM

#8

My buddy has been happy with his GYTR but its hard to gain much power over stock

  • grayracer513

Posted December 01, 2009 - 10:35 AM

#9

My buddy has been happy with his GYTR but its hard to gain much power over stock

On an '08-'09 it shouldn't be. Not in the mid range, at least. Almost anything is an improvement.

  • tech24

Posted December 01, 2009 - 11:03 AM

#10

On an '08-'09 it shouldn't be. Not in the mid range, at least. Almost anything is an improvement.


Really? I didn't think they were that stuffed up, my buddies is '09 and he said its much better. Only other newer bikes that ride with us are Hondas so........

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  • Wes Woodin

Posted December 19, 2009 - 12:23 AM

#11

Yeah, after I warmed up my old 09, 4 hours, run it down it down the street at consistent speed, it would surge. This never happened with my Dr.D

  • Lankyrider

Posted December 19, 2009 - 02:24 AM

#12

I have a Two Brothers M7 slip on exhaust on my 08 and it has a major difference on performance. Although they are all complaining about the loudness of this exhaust we must consider that this is a RACING exhaust. If it is going to be used for trail riding there is a quiet insert that reduces the sound but also the performance. So the choice is always yours.

  • FinchFan194

Posted December 19, 2009 - 11:10 AM

#13

^^^motocross tracks are getting closed down for loud exhaust systems. You won't have any MX tracks to worry about it being loud and "cool" sounding if the get shut down.

  • Lankyrider

Posted December 19, 2009 - 08:55 PM

#14

^^^motocross tracks are getting closed down for loud exhaust systems. You won't have any MX tracks to worry about it being loud and "cool" sounding if the get shut down.


I agree with you, i'm not a fan of loud exhausts either and i use a quiet insert whenever i have to. I'm living in Europe and here you can race with an uncorked exhaust only if the MX track is far from populated areas.

  • FinchFan194

Posted December 19, 2009 - 11:07 PM

#15

I agree with you, i'm not a fan of loud exhausts either and i use a quiet insert whenever i have to. I'm living in Europe and here you can race with an uncorked exhaust only if the MX track is far from populated areas.


Cool I am just not about promoting "toolbox" or "dunegoon" loud exhaust systems:thumbsup:

  • JDAM450

Posted December 20, 2009 - 09:46 AM

#16

I tried my friends Stock '07 pipe and realy liked what it did for the mid range of my '09. I needed a S/A pipe so I went with a FMF Power Core 4. Good price and great power over stock.

  • Wes Woodin

Posted December 23, 2009 - 07:41 PM

#17

Go with Dr. D. It was mad for this bike

  • alstar250

Posted December 26, 2009 - 08:02 AM

#18

YOSHIMURA RS2 - There are a few flat track guys and a slew of MX guys who use this slip on and make some very good power. Quality Yoshimura stuff with a removeable S/A and $300 shipped. That's a very nice pipe

  • sport4_3

Posted December 26, 2009 - 10:11 AM

#19

Go with Dr. D. It was mad for this bike


Agreed! I bought my bike a Ti/Ti dr.d for christmas and its an awesome pipe cant say anything about the power yet because theres snow here, but the fit and finish is AMAZING!!!

  • pbviking

Posted December 26, 2009 - 03:32 PM

#20

only possible problem with the dr d is noise.





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