perfect that growl is exactly what i want but not overkill.

i am not sure if the evomotor sport pipes have hangers. how do you know if you start to get leaking issues?

 

did it set off a cel?

 

follow up after install:
the cat-bypass pipes are a must!! i am very happy with the sound. fuller/deeper throaty sound which is not too loud.

 

Is it just the sound or is there another added benifit to getting the pipes, and having the cats removed?

 

sound was the main driver for me

i have noticed a bit better throttle response. apart from that i think the performance gains are minimal.

 

Jace here is an in-house dyno we did with our catbypass pipes on the GTS.

 

that's a GTS graph?
I know I am not the most fluent with them but 289ft is the most for a 405hp GTS?

 

Yes that is a graph from a GTS that was lent to us by Princeton Porsche a couple weeks ago to do some testing with the bypass pipe.
A stock Cayenne GTS make 405 hp and 369 ft/ln to the crank. The truck that we had on our dyno put down 307 awhp and 280 awtq to all four wheels which equates to 399 hp and 364 ft/lb to the crank. This truck has a 30% correction factor which is what we saw when we did a negative dyno pull on the stock truck to see the drivetrain loss.
After the bypass pipes were installed we saw 318.80 awhp and 292 awtq to all four wheels, which puts us at 414.44 hp at the crank and 379.60 ft/lb to the crank.

Hope this helps

 

perfectly, thanks.

ok, so that's the pipes, have any numbers for the ECU flash for the GTS, alone and them maybe with the flash with a GTS AND the pipes?

I want individual numbers and then total gains if I do both the flash and pipes.

 

We are still working on the ECU flash for the GTS as we speak. I should have some dyno numbers for you very shortly.

 

ah ok, so that's why Calib hasn't called me back with numbers of the ECU flash.... he's waiting on you to give them to him.

 

hey chuck send me a bigger size pic of your cayenne i want to see the wheels upclose ? and is it lowered ??????

 

There are a couple here: https://www.6speedonline.com/forums/...inor-mods.html

It has not been lowered, the GTS sits lower than other Cayenne models.

 

Does anyone have new dyno graphs of a completely stock 2004-2007 CTT and then the same vehicle with the fabspeed 2nd cat bypass pipes?

I'm in agreement the truck sounds much better with the bypass pipes from the videos I've watched and I have them sitting on the floor right next to me. I would probably install them if they just provide better sound / throttle response but no extra HP/Tq. That said, I would likely not install them if they actually take away HP/Tq across the band.

Can someone who actually has a dyno chart of before/after on the same vehicle and the same day please post the dyno.

 

Installed the bypass on my 05 V6 6spd. I was concerned that the sound would be a bit obnoxious after listening to the bobbyspeed you tube video, but I was very happy with final results. At full throttle in the mid to upper range, you do get a bit of metallic rasp. Reminds me of the G35 exhaust for some reason (while in the cabin). At light throttle and steady throttle, it is hard for me to tell it is there. Granted I only drove the car for a day prior to installing the bypass, but my wife hasn't complained and she is generally the primary driver.
Install was very easy as long as directions were followed.