I went extremely excessive with mine and also put big barbs in so I built an idle bypass pipe so I could bleed air past throttle butterflys if I needed to. not a important move but I need idle Regulate. Re: ITB Conversion on 16 valve 4AGE the blacktops ran https://toyota4ageengineforsale71223.loginblogin.com/38268526/5-simple-techniques-for-4age-blacktop-engine-for-sale