[ZED_not_zee]

lintlars,Dec 29 2007, 11:07 PM Wrote:The factory manifold is a peice of crap as far a flow is concerned if you look at the collector if you can call it that the runners all exit into each other one of the poorest designs I have ever seen, it may work but as far as performance is concerned it is far from it.
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that's funny because every dyno proven header for the Zetec I've read about and bolted on has given one or two wheel HP up top and killed some bottom end torque with a poor curve... and as far as stock manifolds go it's better than most.

on the turbo front... unless your running a larger turbo say gt28rs and up.. the lower velocity from larger diameter runners is only going to cause turbulence and have negative effects on a turbo that doesn't flow enough to evacuate the runners... IMO make a brace from the cat mounting locations to keep weight off your poor manifold bolts and factory welds and see where your at... spooling to soon go with longer runners.. too late get a log style manifold... and remember just because a manifold is a good NA option it might not work when fabed to a turbo set up...