'07 YZ450F DEP pipe

I twisted and cracked my standard header pipe and have bought a DEP Header Pipe as a replacement. Any 1 know if i would need to re-jet the bike?? or do anything else?

I see triplicate.....

will this header even slide into a stock 07 cannister (rear pipe) without way too much air leaking?

Not sure if it will fit in. has any1 tried this b4??. Would i need the silencer?

Would i have to re-jet it if it did fit??

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