upping(removing) the 155mph limiter

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I agree with HYFR, i'd not bother, won't get much passed 155, 174 is optimistic.

I'd be surprised if that were true - the B7 RS4 (with "only" 420PS) has been GPS measured by quite a few owners on German autobahns at 168mph or more - when fitted with the standard "155mph" limiter...

So surely the B8 with 30PS more and a slipperier shape should be able to beat that?

I'd wager the crown gear centre differential and the rear torque vectoring diff are slightly more lossy than the B7.
Also the majority of the extra 30 hp gain is above 8 rpm so much harder to exploit in top gear.
Finally the B8 is 7 speed and it may be that 7th is too long and 6th too short.

[Crash_Master]

My old restricted RS5 would do 168mph 4 up I'm told, it got there pretty easy I'm lead to believe, I'm sure the RS4 would to.