3SGTE minds, Tubular exhaust manifold Options

[sphinx]

Sup guys. The basic question is, what are the pros of getting rid of my stock exhaust manifold and replacing it with a stainless steel tubular manifold.

Opinions from all are welcome.

[Insanity-74]

When you are thinking about putting an aftermarket exhaust manifold on a turbo car, you have to be alot more careful than a N/A car, back pressure shouldnt be your only concern at all when fitting the manifold, its all about exhaust gas velocity used to spin the turbo. This is where things start to get a bit more complex, you have to find the fine line between having a wide exhaust manifold to get rid of the exhaust gases qickly and less exhaust gas velocity and having a thin exhaust manifold high exhaust gas velocity but possibly not allowing all the exhaust gases out quick enough. From pure trial and error and bitter experience you need to be looking at a 2.75inch manifold, 2.5 inch works OK if your planning on keeping a standard turbo with few/no mods. 3 inches reduces the exhaust gas velocity to a point where it dosnt spool the turbo up quick enough (unless you gonna have a BFO turbo).

This post has been edited by Insanity-74: Mar 6, 2005 - 4:18 AM