I use one and it fits fine. Plenty of access to the oil filter.

I have heard some instances of the downpipe not lining up, but personally my 02 Elim fit perfectly. I wouldn't worry too much about it.

I have the RnR 2.5" O2 elim and it fits just fine. I've used both the 1G and 2G oil filters with no clearance issues.

I am using it as well, well made and no problems. I did have a little clearance problem but I switched to a 97 vr4 oil filter and it fits great

I had a problem with my 02 eliminator. I could not bolt the turbo to the downpipe the flex section was hitting the crossmember pretty bad. I ended up just welding on a flange so now it just unbolts.