why not go a series 4 13bt. EFi, 189hp stock form (at flywheel), remove AC, power steering .etc and u got a bit more. these are the ones with the decompressed rotors. can run upto i think it is 12psi boost on standard ecu. get a diff ecu, t04 turbo upgrade, external wastegate and your making close on 300-350hp at the wheels. rotors can handle the boost.
and as for the torque factor. there is a Kombi over here in australia with a 13bt in it that makes close on 400hp at the rear wheels and produces over 500nm of torque.
it can send the kombi to 13 second 1/4 mile passes. imagine that power in a bug. absolutely insane.
in my opinion, in a lightweight street car like a beetle the 13bt can provide sufficient torque. and can be very quick. also. nothing like hearing it redline at 9000rpm then letting off boost

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And if you are worried about the 2 stroke noise then do as others have said. get a pre silencer .etc.
this is the reason i am wanting to go rotary in my bug. (i would only go 13b though because of refinement). the only thing that will make me go ej20t is if the 13bt is illegal over here.
Just my opinion. any differing ones be sure to post.
Anthony