with the proper donor car and bracing BEFORE making a single cut, it can be done to factory spec and nobody would ever know the difference unless you gut the interior panels to see the welds. But definately targa all the way in my opinion, hardtops get annoying real fast since as far as performance goes, unless you're at the track a lot, the second you press the gas a little too hard you're getting a ticket...and pretty soon no more licence. Better to cruise in style...topless.