How restrictive would a 2003 R1 can be on an XE 2ltr 16 valve vauxhall engine hoping to make 200bhp EVENTUALLY. Should I forget it or use it to get through sva and then change??
The price could be right but the idea wrong.

does the 2003 R1 can have the cat in?
i have a standard carbon R1 can off a 1999 model and plan to use this for the sva with a cat fitted in the link pipe on a zetec dont know how restrictive it will be though

Have been told they are very quiet and therefore probably quite restrictive. I've got an older one for my crossflow without the cat but nothings running yet.

If i were you I would be looking for something a bit more free flowing, the exit pipe on mine is of a fairly piddly diameter but its not a problem for my engine.

Was busy taking it apart and grinding off bits I didnt need last weekend.

The 98 R1 can was noticeably restrictive on my R1 engined car above about 8000 or 9000 RPM. on a 2.0 that would equate to 4000 or 4500.