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Pmason718

2011 YZ450F What else is needed with an exhaust

16 posts in this topic

No, you will be able to run that exhaust with no further mods. Test it stock and then decide if you like to powerband or not. The Yamaha Powertuner is a great tool (even though limited) and more than most riders will ever need for tuning the engine to their liking. It allows simple and quick trackside changes.

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so you would get the tuner before you bought an exhaust?

Chiming in on this thread . . . NO, I would buy a slip-on only, nothing else!

That's what I did, and I can't believe what a diff that made. It added a lot of high-rpm power, and took away just a tad of the off-idle abruptness.

Just what I was looking for.

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Chiming in on this thread . . . NO, I would buy a slip-on only, nothing else!

That's what I did, and I can't believe what a diff that made. It added a lot of high-rpm power, and took away just a tad of the off-idle abruptness.

Just what I was looking for.

Tuner alone made a huge difference for me.

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Chiming in on this thread . . . NO, I would buy a slip-on only, nothing else!

That's what I did, and I can't believe what a diff that made. It added a lot of high-rpm power, and took away just a tad of the off-idle abruptness.

Just what I was looking for.

What exhaust did you go with?

Tuner alone made a huge difference for me.

What map are you using

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Jay Marmont map. Once I get my exhaust on I will see if it still works great, and tweak and try changes out to see if it matters.

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Chiming in on this thread . . . NO, I would buy a slip-on only, nothing else!

That's what I did, and I can't believe what a diff that made. It added a lot of high-rpm power, and took away just a tad of the off-idle abruptness.

Just what I was looking for.

Your experience with slip ons is consistent with my buddies who ride.

The old adage how fast do you want to go=how much money do you have fits kind of fits the header question. Between the two I would go with a slip on over a header but if I had the moola I would go for a complete system.

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I know on the 09 and older YZ450's the stock header was very restrictive, is it the same on the 2010? Basically is a full system needed or is a slip-on all that is needed because the stock header is not restricting performance?

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It was actually the 08 and 09 YZ450Fs that had the "ice cream cone" mechanical muffler that really robbed power. 10s and 11s went back to conventional type mufflers.

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I know on the 09 and older YZ450's the stock header was very restrictive, is it the same on the 2010? Basically is a full system needed or is a slip-on all that is needed because the stock header is not restricting performance?
The '08-'09 was not restrictive; just the opposite, in a sense. It was too big to be effective with an unrestrictive muffler in place.

In the case of the '10+, the header is perfectly fine as is, and all that's needed is a muffler of the right length and core size. That's why MRD doesn't build (or charge for) a full system for the bike.

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Gray is spot on , the 08/09 header was oversized to add volume for the exhaust to escape into to compensate for the baffeled muffler ( not a good design IMO ) so when you just add a slipon to those bikes you are giving up some lowend because of the large dia. of the header

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The '08-'09 was not restrictive; just the opposite, in a sense. It was too big to be effective with an unrestrictive muffler in place.

In the case of the '10+, the header is perfectly fine as is, and all that's needed is a muffler of the right length and core size. That's why MRD doesn't build (or charge for) a full system for the bike.

So if I bought the Yosi slip-on for this bike what else is needed (Power Commander?)

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