Acoustic valve noise ?? Help

[Ellis182]

Hi guys need some help, ive removed my acoustic valve and replaced it with a straight through cold air feed pipe, but when i started the engine i could hear a hissing noise coming from one of the small pipes which i unattached from the acoustic valve, is this gonna be a problem ? Should i plug it etc...

 

[aucky]

Plug it.
Its a vac line coming off the plenum.

 

[Ellis182]

Ok cheers

 

[Jonny1*2]

cut the pipe close to the plenum and put the end of a biro in it to plug the hole. Tried and tested