has anyone tryed the fabspeed secondary catbypass pipes? if yes please tell me how it sound and if it has any bump in power and torque???? thanksss!

I have them on my 2004 CTT. They sound great - a little deeper growl and rumble outside, with no drone or resonance inside the vehicle. They will "wake up" the truck and give it a little extra something. Probably the best "bang for your buck" first mod you can do for these trucks. Highly recommended!

Congratulations on bringing home the new Cayenne. The GTS is an awesome machine. Look forward to helping in any way I can if you need anything. We sell quite a bit of the bypass pipes and I personally have nothing but extremely satisfied clients that I am sure will chime in here with their results and comments for your confidence.

I have the Fabspeed Maxflo exhaust and just did the secondary cat bypass pipes last week on my 2009 CTTS. Undeniably quicker throttle response / spool-up at highway speeds. They certainly will wake-up the exhaust. Evan really took great care of me while a customer there. The shop is meticulously clean and more refined than anything you would imagine in a tuner / fabrication shop. Fabspeed definitely re-ignited my passion in driving the Porsche, I have been using it as my go-to car since the upgrade. I am definitely looking forward to a ECU tune next.