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I am speaking on behalf of JWMOTORSPORTS....we have made a custom sidemound turbo manifold, just to put to rest the issue of using the sidemount turbo setup...the design in the picture that Joey has posted is a good design..Now franko is also correct in a way in the fact that heat energy affects trubine spooling...but the heat itself doesnt actually affect the turbine...the heat only creates a denser air which means its moving faster...which directly affects performance of a turbo...now on the other hand if you look at the picture of the header/ manifold the final pipe is going strait up ...heat rises..therefore compensating any heatloss which may have occured between the head and the turbo...also...thermal wrap is a great idea and does cause a slight bit of added thermal stress to the manifold...if its made out of mild steel that is...JWMOTORSPORTS manifold is a gread deal longer than typical manifolds but is made entirely out of 1/8" wall stainless steel tubing...now if you look up properties of stainless steel you will find that once it is heated up it will hold heat significantly longer than plain steel...also use a ceramic coating on top of stainless steel for exelent heat retention....Thank you very much and have a wonderful holiday

BuGS wrote: It has been shown, time and time again if the material your Header/exhaust manifold is made out of is quality, then Heat wrap is just fine. Usually crappy quality material or design is what makes them crack.

No, if the quality (Stainless steel 304, mild steel, or ductile iron) is used, their is no need for an insulator. Stainless grade 304 (probably the best choice) is low in thermal conductivity and has low heat transfer capabilities. Another factor - If the wall thickness is thicker, heat will travel through it faster.

I've seen Ti manifolds crack.....I wouldn't call that cheap, would you?

Josh wrote: your turbo is going to get all the heat it neads being hooked up to the exhaust (anywhere in the exhaust). it is best the closer to the motor as possable. but header wrap a bad thing, not even. definatly a good thing.

Yes, heat transfer is proportional to surface area, so it would be ideal to keep the manifold on the short side. Header wrap - it looks like shiat compared to a ceramic coating and has no use for me with my turbo - ever. If I was N/A, maybe. If you guys believe in the wrap so much, then I encourage you to wrap your stuff. Do a dyno run before and after to see if it works for you, seriously...I'm interested to see what gains you get on a manifold like an ETD.

forcedairram wrote: the heat only creates a denser air which means its moving faster...which directly affects performance of a turbo...

Where the hell do you get this from? If the heat is denser, then cold air must be less dense? Physics must not apply here then....

ok point taken that was an error on my part by using the word dense...youll have to excuse me because i was drunk and in a hurry...actually the heat makes the air expand...not making it denser but making it move faster...and once again thank you for the correction but next time try and be a little less of a smartass about it