What catback is this?
 

My car was all stock when I bought it, or so I thought. This doesn't look like other stock exhausts I have seen, does anyone know what it may be? There are no markings on it at all. It looks like the may have been some tips around the pipes exiting the muffler but have rusted off. I have a 93 r1 if it makes a difference.
https://cimg6.ibsrv.net/gimg/www.rx7...ea789c7021.jpg
https://cimg8.ibsrv.net/gimg/www.rx7...2121813485.jpg

Looks like old school HKS dual tip but the chrome covers on the tips are missing.

Thanks for the reply. The only other mod I found on the car was an old school PFS computer with selector switch. It was disconnected and i found it under the carpet when I was rebuilding my engine. I am the second owner of this car, but unfortunately dont have contact with the previous owner to ask. Its surprising that there are no markings at all on it. I guess they may have been on the tips.