Hi from australia
just did what you are thinking of do they are thunder bird manifolds
bolted i turn them around two nices big bends i stop at the rear of the cab two nices muffer and little turn down tail piples i do have a f 700 but lots of room do it you will never look back
sound,s better
go,s better
better on fuel
motor looks cleaner
my be on for 4 years just do it