I've read a few old post on the discussion of placement and how the turbo sits on the manifold between the 2 housing styles. However none went into any discussion on which flows better. Is there any difference between a .63 AR Precision 5 bolt and a Garrett 4 bolt exhaust housing? any test conducted between the two? Is it worth the switch from one to another?

 

The 4-bolt housings a slightly more efficient. The internal wastegate swing arm hole that the 5-bolt housings have makes them less efficient.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">The 4-bolt housings a slightly more efficient. The internal wastegate swing arm hole that the 5-bolt housings have makes them less efficient.</TD></TR></TABLE>

Sort of.....Really its more of a placement issue than anything else. The changes in efficiency can't really be felt on the butt dyno. It will not make much of a hp difference

 

i would think it's very negligible. why not just pick-up the vband turbine housing? .02