Has anyone had any experience with the flange ring on the head-to-pipe?  I took mine off, and am contemplating making my own out of aluminum with fairly large fins for better cooling.  Mine is a 2011 with about 7,000 miles and it runs great!

However, when I took mine off to measure it up, I noticed two interesting things:  1) the flange had been "bowed" from the tightening of the two bolts - not too far as it then runs into the head restricting any further bending - BUT . . . when it does get bent, it doesn't hold the pipe in the head as tightly as I think it was supposed to!  Anyone had any issues with this or thoughts about it?  and:
2) What do you think the original flange is made of?  Just looking at it when it was assembled, it appeared to be chrome-plated steel.  But after taking it off, it was way too light for steel.  Could it be aluminum?  Some I had take a look at it suggested Titanium.  It is definitely NOT magnetic.

Anyone know for sure?

The clamp is chrome plated pot metal.....or at most a cheap grade of aluminum.

Smokin_blue made his own out of aluminum using a hand operated mill.

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