Just finished my ERZ install last week. Did the work myself on jackstands. The cats bolted up without issue. I did notice a smell of burnt rubber after taking the car for a short run. The cats have plenty of space around them so I figure the burning smell might just be something burning off the cats and will go away. I'm happy with the ERZ's.
"America.... still builds rockets!" 355 cid, 350 rwhp
5ZIGEN CBE, ERZ HFC's, K&N drop ins