Quote:
Originally Posted by serialk11r
You think? I don't know much about exhaust design, but if you look at the OEM headers the opposite pairs of cylinders join up in front of the engine, the 4 pipes converge into 2 that sit right next to each other. In that case, putting a twin scroll is easier than a single scroll, since you don't even need to merge the 2 pipes...right?
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for a twin scroll you need to merge cylinders firing opposite of each other so I believe you would need to join cylinders on the opposite side of the engine. Not ideal but definitely not impossible.
these manifolds are definitely more expensive than what would be required for a single scroll but that price could probably dramatically reduced by mass production. Right now they are really only available for racing applications because no one else is really interested.
Subaru is going to have to go down this road at some time or another to continue to reduce engine sizes to meet cafe standards. Either that or they get that electric turbo they patented into production. Either way I don't care as the end result for us would be the same....minimal turbo lag and smooth torque.