If theres a difference between a blitz nur spec r center pipe and say one like this..
SUBARU IMPREZA TURBO CENTER MIDDLE SECTION EXHAUST 3" on eBay (end time 07-Dec-09 11:15:39 GMT)
(i.e. a difference in dimensions in any way

I ask because i have a 3" nur spec back box but no center pipe. so was wandering if this would bolt straight up??