Probably going to be shot as this topic is so common

, following bav's guide is great, But my question is ive found alot of comments saying not to tee into the FPR line, so can someone explain how to get around it... Im keeping the sai at the moment if that makes any difference to ur answer
Thanks

EDIT
confused boys where the the line joins after FPR
Dv to Fpr with this T then where do u join after that?
oneway valve goes to inlet, 112 joins to the old sai tube thing as bavs guide shows, just need someone to explain the Dv line