sounds like you are mostly on the right track...adding the Flowmasters will give the car a nice sound just make sure you dont delete the resonator...it doesnt restrict flow but it does greatly reduce the "drone" you can get inside the car. before you decide to go with a smaller pulley, consider a couple of other mods to help reduce your "KR"...your PCM will retard the ignition timing to reduce "knock" or detonation which will damage the engine...instead consider installing an aftermarket PCM which can optimize both spark and fuel delivery for more power...then look at a larger downpipe and high flow cat to reduce heat and backpressure (this is a major choke point for the GTP)...then try a 180 degree thermostat and a heat range cooler set of plugs...then when you add the smaller pulley the engine can take full advantage of the higher boost...but be gentle on the tranny when you get to that point...300 ponies can do some damage if you get too crazy with the burnouts or the hard launches...change out the tranny fluid and add a shift kit to help spare the clutch paks.
As far as the Lambo doors are concerned, I have no experience in that area...they just arent my cup of tea...I think they look odd on anything but an exotic (replica or otherwise)...but that just a personal opinion...cars are an expression of their owners, so you do what you like cuz its your ride.
hope this info helps and welcome aboard!
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