is the fuel rail better out of a expresso, I have a dohc atx. it looks better. but i noticed it has an extra valve or something... is it a burp valve...

 

They are all equal performance wise...the chrome ones just look nicer.

 

i have that same valve on my fuel rail too....sits dead in the middle, correct?..i guess u can attach a FPR on there or something, but im not sure

 

It's actually a damper.

 

o ok...what does the damper acutally do?

 

It serves as a hydraulic shock absorber of sorts. Electric fuel pumps don't produce a totally smooth, seamless flow of fuel. To the contrary, fuel pump output pulses, and ultimately this pulsing can cause noises downstream in the fuel rail. Of course, the risk of hydraulic noise in the fuel system varies from vehicle to vehicle and system to system.