hello, i saw on ebay a full exhaust system including downpipe and eveything in 3'' diameter all, there says it will fit vw golf mk4 1.8T and jetta mk4 1.8T

so would this exhaust fit into a skoda octavia rs 1.8T auq?

Well one things for sure, the back box would be different length (from box to tailpipe/s, rest of the system I am unsure,.

i think it should fit becouse they use the same MK4 platform right? they also include in the kit a longer TIP for the muffler to fit into jetta so it might fit on octavia aswell... please correct me if i'm wrong!

The basic floor plan of the octy is the same as the golf, but the octy has a much longer rear overhang. This is why the octy has a much bigger boot, and why the octy is much heavier at the back than the golf. It may go on, but expect to find someone to fabricate some additional pipework at the rear end.

thank you all, i just bought it... i just hope that i dont have to do a lot of modifications to make it fit...

Here is a thread about a guy who fitted a Bora exhaust

http://briskoda.net/octavia-i/tailpipe-design/106783/

He had some issues, see page 2