^^yeah, if there is a difference, its minimal. They're both the same size (2X2.25) but the way the pipes run are (very) slightly different afaik.
hid lights hid kits
Hot: 2001 Estoril M Roadster
ZCP 19's, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
ZCP 19's, ZHP knob, GROM, OEM 18's,