Exhaust question

Hi guys

On the exhaust header where the header joins the cylinder is one of the bolts a Allen key bolt and then the other seems to be a thread and spacer with a nut? Because I noticed today that on the front one nut is missing as well as the thread?!?

The spacer is still on somehow but no nut or thread and it moves even though the Allen key bolt is still in also I'm popping like crazy (did it a little before as have akros and sas still) but now it's crazy and my mate said popping little flames is this a likely problem?

Cheers

Hi People !
Would a SDR org headers together with FMF apex's cans fit on my 07 SuperDuke
A original SDR headers give more power than my SD original header right ?
And what remap would I have to get/use ?
many thanks
greetings from Norway

sigh, not again...
no the original SDR uses the same header as the SD.

thanks for answers guys.. after finding and reading a couple of threads about this issue, I found out that apparently its not worth the bother.. ?
I have a 07 SD, and was thinking about buying a 08 SDR akra header to fit with FMF Apex cans. But this wouldn´t give a power gain compared with FMF cans together with my 07 SD header..
Now Im not sure what to do.. Waiting for a used akra titanium system to show up I guess
Or buy FMF Cans and put on my 07 SD header. At a later point I might also wanna fit a power commander, so what exhaust would you guys recommend ??