Don't even worry about it guys. My SVT with custom exhaust passed the Nevada smog test no problem. I can't imagine MI would be any more strict. BTW, my least favorite pet is a cat.
1998 silver SVT E1, #6226 of 6535 (SOLD 12/24/04)
2004 Titan LE 4x4 crew cab
To haul:
2004 Yamaha WR250
2005 Kawasaki SX-R 800
2006 Yamaha Raptor 700 EFI