None taken Half a job Tarmac......
The reason is that the machine polishers are too big for the bolt holes, therefore the process would need to be finished by hand which is timely and the price would be about 3 times as much.
Unfortunately I don't have the time to do this and you wouldn't want to pay the price.
The last customer was happy with the effect and left the holes as they are, at the end of the day they are just a lump of cast metal so they are never going to be 100% perfect but they do still look great polished up.
I can get the real deal too which is a chrome Plenum but your looking at around £350, you could then sell your existing one for £80 -£100 and that would reduce your outlay providing someone wanted it