This price is for one kit Fuel Pressure Regulator, not for four FPR. 

Only red and blue is remaining, no more gold and silver colour.

Adjustable Fuel regulators utilizes an extra light weight diaphram assemply that provides excellent pulsation dampening; to dampen the pressure spikes caused by high flow fuel pumps and cycling injectors (especially non-factory high flow fuel injectors).

there are four different colour (red;blue), so please send the message to me about what colour you like, otherwise we will send the the silver colour as standard.

every parts is brand new

this is universal kit, so for some car may need separate adaptor 

all come with the fuel pressure gauge

any problem just email me, thanks.