I've hit triple digits multiple times at track events and it's been ok but it's definitely worth to upgrade to race version I think ..
Below is my post from my "Functional aero" thread
Quote:
I had a chance to test the front splitter and @Wonderbar Driveway Labs T1 diffuser yesterday, woot! 
ambient temps were about 92 F+ degrees (a more robust oil cooler is a must at this point) and I had to deal with the traffic all day.. I should be able to cut another 4-5 seconds with the current setup easily..
Important things to note, car feels a bit more planted after combining the Hancha/FT86SF front splitter with the Driveway Labs T1 rear diffuser (especially at high speed corners/sweepers) ..braking down feels a bit more improved as well ..either that or it's a placebo effect 
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[ame="http://youtu.be/lqiiD42H0d0"]http://youtu.be/lqiiD42H0d0[/ame]