Speaking for myself, my 2011 stock had a slight lag when the throttle was slammed down for a quick acceleration. I bolted on the K&N Short Rams CAI and that annoying little lag - well, it disappeared... Then came the High Flow Cats and Cat Back, Fast Intentions Exhaust System, with the fewest bends and straightest pipes and cleanest welds I've ever seen, and I do feel a ton of difference in acceleration - She does put me back in my seat, and any girl who has had the pleasure and privilege to be in my car squeals like a little kid when I do so. She's still Stock Tune, she's still NA, but the difference is amazing. I do believe the High Flow Cats make a ton of difference. I've not Dyno'd her, and one day if I do (when I do cause I will and want to do) I will post the update on here. Now not only does she amaze in acceleration, but she sounds amazing with the FI Exhaust. Of Course, she looks amazing too and that still garners a LOT of attention when I'm on the road... I Am In Love with my Z... What can I say...
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