Copper exhaust donuts wearing down exhaust pipes?

[Murse]

I've been told... By a jerk at a dealer... That copper exhaust donuts work well but they eat the pipe instead. Any truth to this? I haven't seen any issues on here. I used them on my 06 worked well I have an 11 Apex now hope it doesn't wreck my $2000 exhaust.

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[HABS 1]

no they dont, had mine in for 3 years and took apart to replaced header pipes that were broke at muffler end and the donuts looked like new with no flange wear, best 80 bucks u can spend

 

[vodoo child]

The guy at your dealer doesn't have a clue what the hell he's talking about! I've been a machinist for 30+ yrs and have yet to see copper "" EAT AWAY "" at a harder metal!

 

[sledhead700]

Hmmmm...... My factory donuts took out both of my header flanges.
I replaced headers and put in copper donuts last season
I was told to cover donuts with hi temp RTV silicone and to shave 1/8" off spacers on the clamps before reinstalling ( by the local bender racing team).
Thats what I did, time will tell.

 

[TBay Sledhead]

Did they wear and then disintegrate and then flange break?

 

[Mooseman]

Silicone, no matter how high temp it is, cannot survive those types of temperatures. Put mine on dry, no issues in 10k+ km.

 

[sledhead700]

Silicone, no matter how high temp it is, cannot survive those types of temperatures. Put mine on dry, no issues in 10k+ km.

Yes ......Tbay Sledhead....... they started leaking and then disintegrated and then the flanges broke (stock Titanium)

Thanks, Mooseman, I questioned the durability of the rtv as well. I was advised to lightly skim the donut and to run a bead inside the clamps.Let set 2 weeks.
I will post,if turns out to be bad advice.
1 seasons, 2500km, ok so far. Curious did you modify clamps? Stainless or titanium Y pipes?

 

[TBay Sledhead]

Are you sure that the gasket didn't disintegrate first and then the pipe broke, because when the gasket is gone it allows the pipe to rattle around in there which I think is the cause of the failure. If you had copper gaskets and titanium pipes I think that it would be ok, but mine broke and were replace by the updated ss pipes.

 

[Murse]

The 2011-up sleds don't have the stainless steel update. Which sucks.

 

[TBay Sledhead]

Oh ya, you have the ex-up valve.