Report Brand New Exhaust Manifolds in Esprit Chat Posted July 25, 2009 Didn't one of the universities in England do some research on behalf of lotus proving that this design basically sucked . . .the engineers at lotus were going with the equal length for each exhaust runner idea . . . being that it was better that each exhaust runner was best if it were the same length. Then when put on a supercomputer in the 90's this was proven to be just a bit of bad guesswork. I.e. the factory started making the new unit that had shorter length exhaust pips the farther back the head you went, so the last pipe was very short to the turbo . . .hence the production models changed and performance was better. I would much rather invest in someone that could make custom headers for this thing, it cannot be rocket science, stainless header pipes, standard turbo fitting . . . and bolts to the head . . . . but that is just my 2 cents. If someone wanted to stay original . . this is the way to go. And dealing with the factory to get these made . . .genius . . .