am i right in thinking you can simply get around the lamba issue with an O2 eliminator?

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�Fail often so you can succeed sooner�

Just an idea, why not consider getting one made to order if you can find a reputavle welder/fabricator that specialises in exhausts? I'm having a twinstack system made up in stainless steel, road legal, and it's not costing near that- a 2 into one for the XT's would only come to about �250 I reckon and that's including headers

Yep, I got an OTR system with no Lambda sensor lug. Just plugged the O2 eliminator in, works fine. Less surging, fuel economy pretty much unaffected.

Have just got the metal mule exhausts but am having a bit of an issue removing the lambda sensor shield thing from old exhaust. Cannot budge those bolts and am in danger of rounding them out. By the sounds of it I'll be having fun with the actual sensor aswell! I'm guessing that shield is important, did everyone else fit that part? If so did you have any trouble removing it?

boneman: I'm guessing you have a Power Commander for the o2 eliminator to work?

Fitted one to my son's (Brucetopher1 on here), 660R. I ended up drilling the heads with a 6mm drill, then unscrewing the remaining threaded part using vice-grips once the head of the bolt is removed. You will need new bolts, hex head are fine as replacements. A BIG spanner removes the Lambda sensor, easiest to slacken it while the pipe is still on the bike - It will be tight. Fitting the new headers is a real fiddle, a ball ended Allen key makes life easier with the manifold nuts, the alignment of the headers is critical... and you will probably get a very slight leak at the sleeved joint, this seems normal and will disappear once the bike has run a few miles and the pipes have reached operating temperature.
You'll really notice the difference, and it sounds lovely with the MM pipes :-)

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Thanks for the quick reply and useful info. Glad to hear I'm not the only one to have issues with that. I've also got the same problem someone else had in there being a bit of excess metal from welding on the inside of the link pipe where the lug for carbon heat protector is. This means I'm also going to have to file that out - at the moment its stopping the secondary front pipe from sliding into place.

As for the leak where those two pipes connect - did you use some silicon sealant? I plan to do that once they actually fit together... am wondering if that will make a difference (?)

I fitted them dry as the fit was pretty good. Expansion with the heat of the exhaust and carbon build up over a period of time seems to have stopped the very slight leak that was there when they were new.

Cheers.

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Just a thought

The new 660 engine is pretty much the same as the old 660 engine won't the old down pipes work ??

I'm sure gonna give it a go

Ill keep you informed

Very cheap option o_O