I fitted a JDM STi downpipe and JDM Fujitsubo RM01A from my old WRX wagon on my FSXT, and the KB XL hangers weren't long enough - the exhaust tip was fully meeting the painted bumper. Instead, I had to use the extra long hangers from Autozone (thanks for the part number, 35719, everyone!).
Now I have a sweet sounding performance exhaust with at least 1/2" of clearance from my bumper without any worries of melting it. :woohoo: