Ever noticed that Imprezas sound like they are "misfiring"???
Well, after listening to some rally car Imprezas, they sound more like a normal 4 cylinder car
After a bit of digging Ive found out why
The Impreza is a flat 4 - 2 cyliners point left and 2 point right. The turbo, however sits to the left of the engine (looking from the front).
The Misfire sound is caused by the time it takes the "bang" from the right hand side cylinders to get to the turbo, and causes 1 of the cylinders to sound like it is firing with one on the left.
The rally cars however use equal length manifolds, causing all "Bangs" to arrive at the turbo at the same time, and give the car a more "normal" sound.
Lol, useless info prolly, but it was something I had been thinking about for a while