1 "H" pipe
1 left hand mufler
1 left hand tail pipe
1 left hand centre hanger assembly
1 left hand tail hanger assembly
2 gaskets (catalysts to "H" pipe)
2 exhaust clamps
If your currant single system is the original you will have to cut the "Y" pipe just in front of the centre mufler as it is all in one piece. Fitting exhausts is a lot easier on a hoist if you have access to one. It would also be better to fit a complete dual system (except catalysts) if your original is a few years old.
As far as I know it does unleash that extra 20bhp, brace yourself!
Regards
Dereck