yeah ive got an apexi back box in the garage , sure its got apexi hypermedallion stamped into the tailpipe , same layout as the standard system , transverse back box , im running a tanabe system at the mo which is identical but has a stumpier tailpipe than the apexi , otherwise they are identical just with different tailpipes .. , its 2 3/4 inch from cat back , not too loud and flows well enough for 411 bhp at 1.4 bar on a 3071 , i do have a custom made 3 inch turbo to cat pipe though.. theyre nice systems .. and not over loud , i like em so much ive got another full system in the garage for when this one rots , im sure theyre mild steel with a stainless backbox