Delkevic exhaust, experience?

[Jambo_imp]

Exhaust pipe joint nut (M8/thread diameter, 8 pcs) - 22 Nm, 16 ft lb

Thanks Peter!

Now I am pretty sure I am supposed to dig out those (what looks to me like) stock exhaust crush washers.
Am looking for some confidence before I get them out, and hopefully without scratching the ports. Any handy tips on that would be appreciated.
In the Delkevic General Instructions link (asterisks added):
We suggest our products are fitted by a professional motorcycle mechanic. Most of our pipes can be fitted using our general fitment instructions. ***********If you are having difficulties fitting your system a few common issues is the new gasket is not installed correctly, the old gasket is not completely removed******** and trying to fit our slip on system to a different companies downpipes. We fit all pipes to the bike to ensure proper fitment and tested before any pipes are made to sell. If you are still having difficulties installing your system please contact us at sales@delkevic.com

I am thinking of starting with a flat end Exacto in the crease, and prying, followed by some graduated flat blade screwdrivers.
Maybe over-thinking/over-worrying it. Just want to hear from the experts.
I am thinking if you don't remove (presumably) the stock ones, the new crush might not properly seal, and the system would be 2mm or so too far forward.

BTW, as I stated, I was contemplating doing the full system and PC w/ autotune in stages. If I install the full system and only the PC (w/o autotune), then I might have to remove from the collector on back to modify the exhaust to accept the Autotune and provided bung for the O2 sensor. I am not sure if that would require loosening, or removing the headers again, and whether I would need new crush washers. Hopefully, it would not require removal of the collector from the headers, or it could be problematic lining things up in reinstallation.
I also, if done this way, would not use any supplied RTV until I am convinced the system is going on to stay. As you can tell, I have concerns about a lot of things....
Looking at the stock O2 sensor (not yet sure if I need to remove this to use with just the PC), it is tightly surrounded by the stock exhaust heat shield. I would prefer not to hack that up, as I might be able to sell my pristine stock system to offset the costs. It looks like a special tool is needed, as a normal socket or wrench is not going to fit in there due to the attached O2 sensor wire. I am thinking I might need to create a special tool that would be a socket with a channel cut out for the sensor wire, to just break the sensor loose before it could be extracted.