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CanadianWR450

FMF 4.1 vs Powercore

6 posts in this topic

I got a 04 WR 450, (Free mods done, rest stock..)going to freshen it up over the winter...

Going to put a pipe (slip on) on while I;m at it, and have it pretty much narrowed down to the 4.1, or the powercore.

No EPA laws here, don't care about noise, don't need a spark arrestor, and I don't really care about weight, bike is a fun / trail beater...

I called FMF and they actually recommended the Powercore over the 4.1, based pretty much on the price difference alone. Price not really a issue as far as slip on's go....

Anyone have any real world comparisons for me?

I would be looking for more bottom end/mid range over top end.....

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If price isn't an issue, then the factory 4.1 is what you want. The powercore mimics the stock YZ exhaust , while the factory 4.1 actually gives power gains across the RPM range, but mainly a strong bottom and mid with a little extra on top.

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If you get the less expensive pipe, spend the extra money on a YZ exhaust cam. The combination of the new pipe and cam will wake up your bike beyond belief. I have done this with my '05 and I am a happy camper!

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look at yoshimura their trc comp full systems are 300 bucks, seems pretty cheap to me, i have the carbon slip on(came with the bike) nice sound

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Cool, thanks for the info...I'll likely go with the 4.1, and the other threads saying after market/YZ intake cam, Hi comp piston, and stock ex cam got me interested as well...since I'm going to be in there.....:worthy:

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Cool, thanks for the info...I'll likely go with the 4.1, and the other threads saying after market/YZ intake cam, Hi comp piston, and stock ex cam got me interested as well...since I'm going to be in there.....:eek:

Let us know how it goes :worthy:

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