yeah its very hard to get ya oil filter of. On my r32 Gts4 was hard to, cause of the 4wd system in the way and some other crap. A 5min job took me like all day to get it of in the end, what i did in the end was get a long flat head screw driver and hammer and punch a hole in the oil filter and use it as a lever to make it lose, then ya can undo it with ya hand. I had to drop my oil filter onto the ground cause it was to tight to get it through the top with everything in the way. I reckon thats why alot of people with gtrs go and do the oil relocate kit makes it alot easier