If you watch any decent car show, you'll know that there is more to performance than horsepower. It's only the American approach that puts a bigger engine in a car to 'beat' a competitor. The Z with a TT kit will NOT be a replacement for an F430.
I think of it this way:
Replacement means identical (or better) in every way. Sure you can make a Z get to 100mph faster than an F430. You may also be able to have it brake from 70-0 faster. But to make the whole package...to corner, accelerate, stop, etc etc better than an F430 you'll need a race team's budget behind you. A TT will make the Z faster, coil overs will help with cornering ability, a BBK with repeated stopping. But you still have a 3300+lb car. Are you going to find a company to custom make every body panel in carbon fiber? How would you fix the 56/44 weight distribution in the Z without adding weight to the back?
Just like in the video games, building a car doesn't make it drivable. You may end up with a terrible handling beast that is more of an abomination than a Ferrari killer. I'd suggest to enjoy the Z as it is or up your budget and buy a different car.
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2013 Cadillac V-Wagon, RIP Z
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