I went extremely excessive with mine in addition to place big barbs in so I designed an idle bypass pipe so I could bleed air past throttle butterflys if I required to. not a necessary step but I want idle Handle. Re: ITB Conversion on sixteen valve 4AGE the blacktops https://blacktop-4age00425.frewwebs.com/31933626/the-basic-principles-of-blacktop-20v-4age