View Full Version : KA Turbo question: preferred style of manifold?

09-11-2002, 08:10 PM
My future plans involve rebuilding a KA engine and turboing it. My question is this.....what style of intake manifold is better...."log" style..or a ported and polished (maybe extrude honed) OEM "runner" style?

What are the benefits and drawbacks of both?



09-11-2002, 08:54 PM
What do you mean by "log style" intake manifold?

09-11-2002, 09:07 PM
I am sure he ment to say exaust mani. Logs are strong, partly becuase they are compact. This also lends the mani to fitting easyly in the engine bay.
A header style will always make more horsepower.
I think the preferd type is the one that fits and is cheap and doesn't crack.

09-11-2002, 11:10 PM
Nope...not exhuast ...intake manifold. "Log style" is like the Greddy intake manifold for the SR...it looks like a skinny football with short runners.

So...my question was, a ported and polished OEM intake manifold versus a "log style".


09-12-2002, 12:13 AM
Well a ported OEM Manifold will tend to preserve the harmonic tuning properties that Nissan engineers designed into it. A custom built plenum-short runner manifold will improve the flow at higher engine speeds, but the low end will suffer.