DJVe

does anyone know why turbocharger systems use a restrictive exhaust manifold design compared to an equal length design? obviously on na cars, switching from restrictive simple manifolds to equal length 'headers' yields good flow/scavenging improvements. so how come turbo systems, either oem or aftermarket rely on more restrictive manifolds? is it simply a space issue? i have heard they prefer the cast iron manifolds for turbo systems over stainless steel because of the higher exhaust pressures, but why the restrictive piping design?

DJVe

can someone please move this, i don't know how it ended up in suspension and brakes -______-

Candela

iTrader: (1)

If you want equal length, buy a tubular manifold. The log manifolds advantage is faster spool, no manifold cracking and more space. Companies don't "prefer" one over the other, although it seems tubular manifolds have yielded higher horsepower throughout the years of turbocharging.

INTIMAZY

iTrader: (5)

Logs are usually cast. That makes them easy to mass produce for cheap. As cheap as ebay tubular manifolds may seem, it's still much cheaper to make a cast manifold.

Durability is a nice side benefit of cast manifolds.