Best slip on for 09 yz450f?

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

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

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.

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.

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.

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.

FMF factory, cheap cheap cheap right now.

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

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.
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........

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

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.

^^^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.

^^^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.

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:

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.

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

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

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!!!

only possible problem with the dr d is noise.

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