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CORONASwLIME

Stock vs. aftermarket

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When I bought my 06 i tried the insert first and it was okay but I had a 04 YZ450 setting there with a powerbomb header and can so I decided to switch it out just to see the difference. Get the exhaust.

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+1 for pipe / header.

i did megabomb + q4 and i love it. also very quiet for those of us in overly regulated Cali

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.

There is little improvement to be gained by simply fitting an insert.

The rest of the muffler restricts flow too much.

If you're on a budget then open the muffler up properly and fit an insert for reasonable power improvement. Add a YZ450F header for full-blown version!

I have ridden, back-to-back, identical (apart from the exhaust ) WR450Fs and I can categorically state that a properly modified, stock muffler, coupled to a YZ450F header performs as well, if not better than a (very loud) "Race" White Bros full system.

In summary: if you have heaps of money and like to waste it then buy an exhaust.

If not then do the mods.

Check this out and you'll see what I mean.... http://www.thumpertalk.com/forum/showthread.php?t=349760&highlight=Modified+Muffler+saves+big+%24%24%24%24

Greg

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