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Originally Posted by Michael Ghia
Within racing Porsches, the figures achieved using Porsche boxes have been as follows.
901/914 250bhp max. This is without launching it as with Porsches it's used for track racing.
915 450bhp max... you'll need an LSD from about 300bhp onwards to get the power down. Russ Fellows (street and strip bug) is chucking 350bhp through his with an LSD and is breaking 944 driveshafts so it's pretty strong.
Bug box... I think about 100-110 bhp is usually the norm but if you go sidestepping the clutch at 5,000rpm every time to you want to set off.. it won't last long.
IRS boxes are not as strong as swing axle, you'll break the output shafts from the diff after a while.
T2 5 speed gearboxes, forget the 5 speed. It's a dogleg 1st and it's a lot weaker than a 4 speed.
T2 4-speed is used a lot in offroading and drag racing and if you want a very serious box which you can pull wheel stands in... then this may be it.
MG
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Stupid question, but how do you know the difference between an IRS and a swing axle box? ANs what about the 002, and 091 in terms of bhp/ft lbs