[thstone]

Downside?

Is this a race car or a street car?

If its a street car, then consider when you try to sell the car and the shop inspecting the car tells the prospective buyer that the shock towers have been permanently modified and there is no way to return to car to stock condition?

The prospective owner then asks the shop why someone would perform this type of modification and the shop says "most likely to get more neg camber so they could track the car". You say that it was never tracked but the buyer walks away anyway as there is no reason to take the risk on your car with so many other un-modified cars for sale.

Very few buyers will trust that an owner knew what he was doing when modifying the shock towers and will assume the worst (that the car will suffer from long-term alignment issues that can never be repaired).

I would suggest camber plates or adjustable lower control arms which can be advertised as a upgrade and/or which can be removed for re-sale without permanent damage to the car.