'05 YZ450 exhaust question

[TajMan]

Hey guys,

so my awesome '05 YZ450 here was apparently a former AMA supercross race bike, a Yamaha/Graves #19 bike! later converted to supermoto

Its the (most gloriously) loud 450 single I've ever heard before..

It has an M4 Titanium exhaust system (off-road)

 

..but I'm making the bike street legal now, and I don't want to attract attention.

 

question: will this FMF Q4 muffler fit the titanium header pipe that is on my bike now?

http://www.ebay.com/itm/FMF-Quiet-Performance-Q4-Muffler-Yamaha-YZ-450-F-03-05-WR-450-F-03-06-044199-/390555982924

.. or does it require a different header pipe between the head and this Q4 muffler/pipe??

 

great riding around Salt Lake Utah

[grayracer513]

Maybe.

 

The trouble is that no one knows how the diameter of your current header compares with the stock one. 

 

You could pick up a Q4, and if it does not fit, you might be able to have a shop fit a stepped sleeve to it, or, find a Powerbomb/Megabomb for sale used, which would absolutely fit the Q4, and take another db or two off in the process.

[TajMan]

That is a great answer to my question!

 

Wow, difference between the powerbomb and megabomb design...

and price, $166 vs $314 for megabomb (~, new)

 

I'll see if I can find used first..