This thought doesn't directly have to do with K5's directly, but could apply if you wanted it to... -=Background Story=- SO! Here I am driving down the road and thinking of buying a cheap old anything-I-can-find-under-$600 motorcycle. This would probably end up being an old 2 or 4 cyl Japanese bike. But I would like something kinda unique. So the idea pops into my head that I could grab a turbo off of a Saab from a junkyard and fab it onto the bike. A small turbo for a car, but should be pretty good for a motorcycle. Seems easy enough, just basically fab up a new exhaust with one pipe, route it through the turbo and do some fabbing on the intake to hook it up through the turbo. Possibly add some cooling fins to the turbo and an intercooler infront of the frame behind the forks. Pretty easy. The hardest part would be the Turbo Exhaust manifold, which still wouldn't be too hard if you didn't mind it being stupid simple and ugly. -=The Idea=- All this gets me thinking about Turbo Exhaust manifolds in general. To me they seem VERY badly designed. Just a straight, log-type, all into one manifold. The flow characteristics must be a nightmare. The flow must be intermittent due to some of the cyl's being close and some far, not to mention the backpressure caused by it all dumping into one pipe. Now, if my idea on headers is correct they are designed so that all the pipes are of equal length so that the exhaust from one cyl wont interfere with the exhaust of another cyl due to the seperat firing order. Nice smooth exhaust, low backpressure. So, why don't they do this with Turbo's?! It seems to be it would be greatly more effecient if it were constantly getting the same amount of pressure at a given rpm than it getting bursts. Not to mention the fact that the cyl's would no longer be fighting with eachother from the exhaust pressure. It wouldn't be hard, just make a shorty type header and at the collector fab an adapter for the turbo. -=My Problem=- But I make this sound a bit easier than it truely is. If you know how Exhaust headers work then you know that the specific length of the pipes matters due to the resonance of the exhaust. Which is why some headers work better than others. If I remember correctly my Carburetors & Intake Manifolds book touches on resonating properties, but just briefly. Does anybody know more about resonating properties and how to calculate them? Also, what about my idea in general? Am I thinking correctly or is there a specific reason that companies use the super-bad flow manifolds? Or do I just have WAY too much time on my hands and am suicidal for wanting to turbo a motorcycle?