for a 99/00 impreza

 

Unless your asking for the vacuum tube you should'nt need pipework to fit a HKS BOV to a 99/00 Impreza.

This year model has a bolt on to intercooler fitting and HKS do a BOV with a flange which allows a straight forward 2 bolt fitment.

If your HKS bov is an earlier (non bolt on) model you may struggle unless you can get a flange made up.

 

there are 2 pipes one thin one and a large diameter pipe from the flange (attached to intercooler) to the bov itself

I need both, original ones are perished