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wr250f fmf ti-powercore or fmf 4.1

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Ice riding this season i bent my exhaust in half. So time to get a new one. I originally had the fmf 4.1 with mega bomb. It felt great. I was wondering what is the difference between the 4.1 and ti-powercore is. Either one would be paired up with the mega bomb. Why is the 4.1 more expensive? Does it have any extra performance over the ti, or just lighter. Im not concerned about weight or sounds. Just the performance out of it. Also im  pretty set on getting an fmf so not looking for other pipe recomendations

Thanks

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The 4.1 will have better performance gains than the Powercore  the material it's made of has nothing to do with performance, only weight. The aluminum 4.1 still has better performance than the TI powercore, but the TI powercore is lighter. 

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