I love those P107's too. I ordered them for my personal vehicle as well although in Frozen Brushed Gold. For the drop we used Novitec's Sport Spring Kit.This kit is for all models including 458's with the factory lift-system.
I've used the exhaust bypass control by Capristo on both my 430 and 458. Easy plug and play install, allows you to use the 'race mode' exhaust setting with the press of a button. I see that Forza is offering one now for $375, Google: Model B2 Exhaust Bypass Valve Controller Kit. You won't regret it!
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