[odepaj]

Originally Posted by SubaruSVXCrazy

I don't know a thing about svx headers but it be amazing if there where a set we can buy aftermarket uneven for the boxer rumble. Like the imprezas.

That wouldn't really be that hard to do....

Of course, it still wouldn't sound the same because part of that Boxer rumble is the 4-cylinders exhaust strokes being 180* apart (plus its got a turbo).

Flat 6's are generally alot smoother than most other engines because they balance themselves VERY well. That third row of pistons really makes a difference.

Wiki edit:

Originally Posted by Wikipedia

The movement of the pistons in a horizontal engine is all in the same plane, so it creates less vibration than in a V-configuration engine; particularly one with an odd number of cylinders on each side of the engine, like a V6. Unlike the V6 but like the inline-6, the flat-6 is a fully balanced configuration which is in perfect primary and secondary balance. The three cylinders on each side of the crankcase tend to have an end-to-end rocking motion, like a pair of straight-3 engines, but in the usual boxer engine configuration, the imbalances on each side cancel each other, resulting in a perfectly smooth engine.

The flat-6 is also smoother than the flat-4 or inline-4 because the power strokes of the cylinders overlap in a four-stroke cycle engine. In these four-cylinder configurations, pistons are 180 degrees apart in crankshaft rotation and start their power strokes every 180 degrees, so each piston must come to a complete stop before the next one commences its power stroke. In the flat-6, each power stroke begins 120 degrees after the previous one starts, resulting in 60 degrees of overlap between power strokes and a much smoother delivery of power to the flywheel. This intrinsic smoothness is desirable in cars, motorcycles, and light aircraft which are more powerful and expensive than more common designs.

Dustin