Mine have been installed for about a month or so now... great items and Moncef from Admin Tuning is a good guy to work with.
I haven't been able to install my Z1 upgrade filters with the velocity stacks as I haven't been able to find anyone locally to cut and re-weld my crash bar, but beyond that I don't have any negatives... I will say that they're a bit of a pain to fit due to their size, but it is what it is.
I can't give you a cut/dry how it is over stock though since I had a lot installed all at the same time along with a couple weeks of data logging/tuning from Seb at Specialty Z, but the car is a blast to drive and throttle response is greatly improved.
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