check out this exhaust manifold, GT35R powered alltrac by speed-source Options

[jgreening]

Car porn for you perusal:

[playr158]

I'm sure you know better than the craftsman that created that masterpiece Dan.

response:

Paying for less performance--exhaust manifolds

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We've all seen the big, blingy exhaust manifolds on some of the expensive turbo kits with long pipes running up and over and under and down. The manufacturer says it provides equal length tuned runners to scavange the exhaust away from the cylinders. Worth the money? Usually not.

Turbines run on heat. The hotter the exhaust, the faster they spool and the more boost they can make. Need proof? Try this for an experiment on your EMS: take out several degrees of timing in the spoolup and boost region of your maps. The EGTs climb and you'll notice faster spooling and, if your turbo setup is right on the edge of boost creep, you'll get more boost creep.

The problem is, those beautiful, long, shinny pipes act as radiators. They lengthen the distance that the hot exhaust must travel between the port and the turbine and radiate that heat off into the engine bay where it becomes a liability rather than a benefit.

What about the scavenging effects? Bogus! As you start to push your turbine to make big power (whatever big power is for your turbo) exhaust manifold pressure will increase substantially and the scavenging effects of the returning finite pressure waves is greatly minimized. So much for all those beautiful pipes snaking all around the engine bay.

What works best? Short pipes coated with a thermal coating. In fact, the stock exhaust manifold coated and ported is probably going to outperform just about anything you can get out there.

food for thought reading and research for anyone interested
part 1: http://www.mr2oc.com/showthread.php?t=6629...age=1&pp=30
part 2: http://www.mr2oc.com/showthread.php?t=6701...length+manifold