sorry to sound stuped but my mate told me to put mine after the fuel rails so fule gose in the comes out thought the reg and then bak to the tank or what ever, but just been told t hats the wrong that and it should go before?
any one shead anylight on this?

 

AFTER

 

After, icreases pressure in the ra, that why its after

 

luke, get a mcdonalds straw, blow down it, use your finger over the end to regulate how much air leaks out the end of the straw, this will dictate how much pressure is in the straw.

Thats all it does.

 

that people just checking