No clue who made it? Are you saying you have an 18mm bung hole and someone removed the 02? Go to a muffler shop, see if they have 18mm caps to close the hole?

Definately an Akrapovic full exhaust system with a Carbon Fiber cannister.

The RACE system has a Stainless Steel header. The EVO system has a Titanium header. The RACE sells for $1,200 new. The EVO lists for over $2,000 and weighs less than 7 pounds total. Akrapovic makes a decibel reducer that fits into the end of the cannister.

I have the EVO on my 2008 ZX14. With a PC3 and custom dyno tune, mine makes 190 rwhp on the local dyno. All the dyno graphs I have seen show that the Akrapovic EVO makes the most midrange power of any aftermarket exhaust.

When I purchased my Akrapovic EVO, it came with the O2 bung welded onto the pipe. I am not using an O2 sensor, so I inserted the supplied plug from Akrapovic to plug it off.

* Last updated by: zxrider11 on 2/4/2015 @ 3:52 PM *

If all you need is a plug for the o2 sensor, google it. I've seen them for sale on the web. May be different pitches so check that. Measure the hole with a calipers to find thread diameter, then go to Ace to pick up the two or three different thread pitched bolts that have that diameter. Find out which one fits, you know what to order. You want one that is the right length to minimize obstruction. Also, the bung plugs might be made of a special metal. If you use high temp anti seize and check it often, you might get by with just an ordinary high quality bolt from Ace. There is probably a torque spec you should use.

Maybe these things are a special pitch? Better be careful screwing anything in there if it is not a bung plug. It should go in easy if the threads are clean.

http://www.summitracing.com/parts/vpe-1195a?seid=srese1&gclid=CjwKEAiAo8emBRCX_OqU4qek6y8SJACzgf8f8eE9ZiLzB9cHisOgShFeQmicqNpU49--Ygw4BusuVBoCqIzw_wcB

they say on that link it's steel, zinc plated. It's probably zinc coated for rust protection.
I'm sure if you found a stainless bolt that fits and spot welded it to keep it in place it should work, although I never had an O2 sensor come loose.
As Hub said exhaust shops have them also or they will weld up/close the hole. Bolt/plug is easier as you don't have to remove anything.

Happy to say its the evo TI