Pipe sizes

[Chris.]

True.  I understand the head is 36.6mm and the exhaust manifold on a stock manifold are 38mm

[danny_p]

you actualy want a lip between the head and manifold on exhausts,  runners want to be slightly bigger than the port,  ll to do with pressure aves and refections blagh blagh blangh


also whne it comes to 20vt exaust manifolds  it's practicaly inpossible to make anything thats worse than the oem one

[Chris.]

True.  I just dont want a T04e spooling at something like 6k and being crap.  WAnt it spooling as early as possible.