Hi there I new to the site I have a 2003 impreza wrx silver with pro drive back box,
I have bought a dump valve for the car and could someone please tell me what size of blank plug I need.

 

Oh no.

 

Why oh no ??

 

 

I think it is generally felt dump valves are a bit tacky and pointless. They do nothing for power increase and if anything can lose you power if it is a cheap poorly made one.
Personally I think they are a bit retro and 80's/90's now days and wouldn't fit one. Each to their own though.

Taken From Duncan at Race Dynamix
– a vent to atmosphere dump valve will not improve the performance but if you must fit one for the sound then stick to a good make – forge have always been good from what I have seen. (Baileys are less so)

http://www.racedynamix.co.uk/remap/s...ewage-2-0-wrx/

Good luck

 

Good man thanks for the reply maybe I'm the retro type then!! I'll fit and give it a go,at least the noise will **** the wife off!!!!
Any idea of the blank plug size for my car.
Cheers Paul

 

From memory I recall 25mm for some reason.. not 100% on that though.
I would suggest pulling the pipe off and trying to measure it with a vernier caliper if possible?
I can measure on mine but I have a Hawkeye WRX and not sure if the pipe is the same diameter as yours.

 

Good man thanx for the reply

 

If keeping the Mass Air Flow (MAF) sensor which is located on the outlet of the airbox you are better sticking with a recirculating ONLY DV otherwise the fuelling will go to pot eventually killing the engine!

 

these guys seem reasonably priced and many various colours
http://www.autosiliconehoses.com/sil...ing-plugs.html

 

Im using a couple of these ones ^^^^ in different places on mine. Good quality although the print comes off the end. Just give the hose ends a quick measurement