Love the write up and story mate.
What is the part number of the muffler and the quiet insert? How loud is it without the insert? What is the measured weight saving over stock?
Also please discuss lighter options from fmf
The 2012 WR page only lists 2 mufflers, the Q4 Hex and the Powercore 4 Hex. Neither is Ti. One has a claimed weight of 6 pounds, the other 5.5 pounds. The Powercore doesn't have the insert.
The stock muffler with clamp is 7.45 pounds.
It turns out that FMF mufflers for the 2006 to 2009 YZ450F exactly fit the 2012 WR450 except that the midpipe lightly touches a ridge on the top of the transmission. It appears as though the YZs of those years had different header sizes as my kit came with 3 different bushings to allow it to fit up to various headpipe diameters. One of the bushings was a perfect fit on my stock WR450F header.
I purchased the Ti Powercore part number 044230. It has an advertised weight of 4.8 pounds. It does not have an insert. It fit my bike perfectly, however, it weighed 5.2 pounds, not 4.8 as advertised. Very disappointing. Furthermore, one needs to install the quiet insert in the muffler. This adds a further 0.2 pounds over the spark arrester alone, bringing the total weight to 5.4 pounds. Again, disappointing. That amounts to a net weight loss of 2.05 pounds.
My friend has a 2012 YZ250F. It appears that the muffler system on it is exactly the same as the WR450F as well, though we didn't measure the diameter of the headpipe exit with a caliper. The YZ250F has more available pipes than the 06-09 YZ450F, some of which have carbon fiber endcaps and Ti midpipes. The midpipe on the 044230 muffler is stainless steel.
If one believes the claimed weights for the 2012 YZ250F mufflers, the Ti Factory 4.1 RCTs weigh 4.3 pounds WITH the quiet core installed. That is a savings of 1.1 pounds over the 044230 muffler I used. However, these mufflers are about $75 more than I paid for mine, after I factor in buying the quiet insert in addition to the muffler. I wish I would have known this before I purchased mine.
Edited by MidlifeCrisisGuy, September 15, 2013 - 05:45 AM.