I have z-teks on now.... the fitment wasn't perfect on the left side, and the idle sound isn't great. At WOT they sound very nice; however, if I floor it ALL the time, chances are I'm not going to be driving my baby much longer. They're not BAD, but.... lets just say I got what I paid for. (they do have a VERY convincing ebay ad though)

I had the bypass pipes. I L O V E that sound, but I know its not for everyone. Give up any idea of talking on your cell phone if you have bypass pipes on. They are also likely to drown out your music (atleast they drowned out mine... but I have the crappy speakers)
I had to take the pipes off because my future Mrs. told me to.... but now she has her own car. Now, as soon as I have time, they're going back on. (sssssshhhhhhhhh! don't tell her!!!!)

 

Just installed the AfterHours pipes & I'm glad I didn't purchase another system. The perfect exhuast for the NA 996. Great idle sound and even better WOT sound. Fitment was perfect, installation a breeze, and they're SIMPLE and only 8 lbs. per side! I highly recommend this system to anyone upgrading their 996 exhaust. Thanks Brian!