According to the 2004 Ford Mustang Owner Guide :
( " regular " unleaded gasoline , 87 octane )
91, to my displeasure.
" regular " unleaded , 87 octane
The 2004 Ford Mustang has a V6 engine.
87
The V6 engine in a 2004 Ford Mustang has a timing CHAIN
( 5W-20 ) according to the 2004 Ford Mustang Owner Guide
86 or higher
5 W 20
I believe that is ( 210 horsepower ) for the 2004 Ford Mustang 4.0 liter SOHC , V6 engine
3.8 or 3.9 liter
An X pipe is a modification for a dual exhaust. As far as I know all the V6 Mustangs have a single exhaust... So no.
The Mustang V6 does not have a timing belt it has a timing chain which normally will last the life of the engine.