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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 458855, member: 8143"] I am currently in the limbo with a set we just put on. I currently have the cab in limbo as well. The 2.5 up pipes are not working well with the cab and down pipe. We have the latest design second only to the one leen is sending out to be tested now. I have done some comparison to the 6.0 manifolds that I have sitting here. Really the manifold volume itself is not that much different from each other. But when you figure the up-pipe volume difference between two inch and two and a half over the length there is a huge difference. We have the same 6.4 litre air pump filling the manifolds and up-pipes. No matter what one tries, it takes longer to fill the the big up-pipes. There is roughly 155% more volume in the 2.5"from version over the 2". I am currently contemplating the outcome of scrapping the 2.5" pipes and building a custom 2" from some old factory pipes with the v-band off of the 2.5". There is no reason that the steed speed design is that terrible by principle, they fix the problems that a log style manifold has by design, IE: by directing flow in the direction of the outlet smoothly instead of going straight out and slamming a 90° wall. Even reverting backwards in some cases until the cylinder ahead of it forces it back out. Personally I would like to see the same manifold dynoed with 2" pipes. Even though it is a little incorrect to the original purpose of the 2.5" outlet. [/QUOTE]

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