As I understand, it allows air direct to the idle control valve to assist effective anti-lag strategies. I have used it to good effect but the car is going back to standard(ish) so now for sale. Current new cost £100! It is in very good condition, in spite of some markes from jubilee clips. £30 including uk p&p.

 

what type of scoob is this off.? i have a 96wrx will this fit

 

It came off my 1996 WRX STI RA - so assume it will. If you are interested I'll take a picture of it held in place and e-mail to you so you can see how it fits.

 

Now sold, pending receipt of funds.