Hopefully I'll be in a position within the next week or so to buy my GT28R or RS, havent made up my mind yet.
Now a freind of mine said he'll help out making up a downpipe. Now I'll be using this and mating up my pipe to it. The only thing is that the bore is 2 3/4. Will this be ok?

Yes, it is playing (70 mm inside). If you put it on, you can´t take the oilfilter off. Pipe must begin about 45 degrees to the front and then to the same way as the orginal exhauspipe.