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What about a compound turbo setup? Your I6 arrangement lends itself nicely to this. Google for 'eclipse compound turbo' and you'll find a thread of someone doing exactly this to an I4 2.0 making a massive amount of low down torque and spooling up the big turbo very quickly.

http://en.wikipedia.org/wiki/BMW_N63 features a reverse-flow air design in which the turbochargers are mounted in the engine valley and the intake manifolds are located on the sides of the block. This new design creates a more compact engine package and reduces the width of the assembled...

ok cool, thats sort of what I was thinking. The reason for fine tuning 4th gear is that the car would be past the redline down the 1/4 mile with stock gears, and with 3.73 gears it would be a bit too high, but you're probably right :)

Simple answer is that it is a huge amount of work to crack open the gearbox and gearsets don't come cheap. It takes about two days to get the engine, gearbox and transfer case out of the engine bay, the change itself is fairly easy, but then it all has to go back in again. I think the 3.73 is...

A customer of mine has a Mitsubishi Galant VR-4 that produced 206kw and 373nm from the factory, making about 160kw ATW. The stock gear ratios are rather short and we are now right at the redline in 4th gear over the 400m, and when cruising on the highway it runs at 3000rpm at 115kmh. First gear...