yetis

I have the Cargraphic exhaust and bypass pipes on my CTT. It's louder, but with the insulation glass, it's still tough to hear, without the windows open. If your outside however, its another story. Only this weekend did I hear the CTT with me not in it and I think it is plenty loud. All the looks now make sense....
On the turbo, you do get some extra cabin noise, with the removaled of the secondary cats. I will assume that it's mostly turbo sound. Personally, if I wanted a Lexus, I would have bought a Lexus, so I am ok with the sound.

As I mentioned before, by dealer said to keep the stock secondary cats, "just in case". Take that as you wish.

Slow Guy

There have been resonance issues with other model P-cars. I've heard nothing, good or bad about them on Cayennes. Don't even know if they make them for the Peppers.

Wouldn't put them on my 993 though.

medtech

Go to the Fabspeed website, they should have sound clips for ya.
All Cayennes have 2 sets of cats. All we are deleting are the secondary cats, which porsche mostly uses for noise reduction. I ripped them apart before I threw them away and it's not even a real cat, just a small muffler.

Slow Guy

Thanks for this bit of info, I didn't know this. Personally I wouldn't be interested in removing a "real" cat but a "simulated" cat would be another matter entirely for me.

Thanks again.

John@Fabspeed

Hi, Alex from Fabspeed here. Just some info on our Cayenne 2ndary Catbypass pipes. All Cayenne models have two sets of catalytic converters. The primary set which have 02 sensors plugged in and checking to make sure the cats are there and working properly. The 2ndary catalysts Do Not have any sensors before or after them and are there to keep the power and sound down. They are not needed and can be taken off and replaced with our catbypass pipes for sound and power improvement. The car will comply with warranty and all emissions and make the car sound deep and throaty. If you are interested, I will do a discount for all Rennlist members.
PM me for more information or email me at Alex@fabspeed.com

Thank you,
Alex@fabspeed
Performance Specialist

www.Fabspeed.com
283 North Main Street
Ambler, PA 19002
215-646-4945 Phone

VVG

Placed my online order just a few days ago!!!! Can you credit me back anything??

stealthTT

I have the Fabspeed cat pipes on my 04 CS and I love them. Since my car is my wife's DD, I dont have much time to drive it, just only on long trips. since I have installed them this weekend was the first one when I've about 3-400 miles on mine mostly on highway, and I can to say that the sound is way louder outside but not disturbing - not in the cabin, still imo you'll need to do the catback also- as I'm prepared to do.
I will do mine at a local shop, since I'm far away from US, and the shipping is stupid expensive, OEM sound a little bit raspy for my taste after 3k rpm.
gl.

thanks Fabspeed!!

Ilie.

John@Fabspeed

Thank you for your order and contact me directly and I will see what I can do.
Email me at Alex@fabspeed.com

Thank you,

Alex@fabspeed
Performance Specialist
Fabspeed Motorsport USA

283 North Main Street
Ambler, PA 19002
215-646-4945 Phone

Slow Guy

First, I placed my order for the "cat bypass pipes" this AM.

Second, and I'm being picky here but instead of calling these things "cats" they would more properly be called pre-mufflers. I suspect there are others like myself that would be very hesitant to remove a cat from a modern "emissions tested" vehicle but would have little objection to removing a pre-muffler that doesn't affect the emissions system.

Fabspeed might sell a few more if they point this out a little better in their advertising.

VVG

I'm uncertain whether these are in fact a second set of catalytic converters that are not involved in the engine management feedback loop or whether they are just resonators.

cab&coupe

Alex how much with a Rennlist discount and can you post an audio clip? (Kooser test)

Slow Guy

Email or call them for the RL discount (I did) and the audio/video clips are on their web site.

Slow Guy

See MedTech's post # 18 above and Porsche has used pre-muffler's before.

John@Fabspeed

Here are some video clips of our 2ndary catbypass pipes/exhaust on various Cayenne models. Again sound is subjective and a bad camera can detract from the actual sound. The 2ndary catbypass pipes enhance the aggressive sound of the Cayenne but the rasp also increases. To obtain a throaty, deep sound with no rasp--the Maxflo exhaust combined with the 2ndary catbypass pipes and BMC air filters will transform your daily SUV into a fire breathing Porsche Cayenne. Please visit www.fabspeed.com for more information regarding exhaust products for the Porsche Cayenne vehicles.

Cayenne Turbo with 2ndary Catbypass and Fabspeed Exhaust
http://www.youtube.com/watch?v=qldZMz9ZWRo

2008 Cayenne GTS with/without Fabspeed Catbypass Pipes
http://www.youtube.com/watch?v=fzWRxdC7lrA

Fabspeed's 2008 Cayenne GTS 2ndary Catbypass Installed
http://www.vimeo.com/1266129

Slow Guy

The FabSpeed Pre-Muffler (Cat) Bypass pipes came yesterday and I installed them last night. Took me about 2.5 hrs. start to finish but at least 1/2 hr of that was spent trying to figure out how to get a good wrench/socket on that upper nut on the passenger side flange (and the fact I was using 13mm tools when the nuts are 12mm!) I started with that nut (always start with the hardest) and once that was off the rest of the task was fairly uneventful. 2 of the studs broke off but they stay with the pre-muffler flange and FabSpeed sends new hardware (and gaskets) anyway.

Fit is fine, no issues. That flex pipe/flange from the cat would make tolerances a little less critical anyway. Welding looks like welding to me, I see no issues with it. Finish is great, I'm no expert on metal finishing but this sure looks like a nice job to me. I cleaned up the pipes before backing the car off the ramps, they shined up well.

Since my M3 is still on the scissor lift I just used a pair of those plastic drive on ramps in the garage to install the pipes. This was pretty much the perfect height (for me). Couldn't have used the creeper but sliding around on the old carpet piece worked well.

I think I could do the second set in under 2 hrs., and that's not trying to rush, if I could remember all the exact tools I used I could get it down to 1.5 hrs., this is not a tough task. The one suggestion I would have for someone doing this is make sure you have a "3/8 flex head curved handle ratchet". Otherwise, getting those 2 upper nuts is going to be a lot tougher.

This is the ratchet I use, mine is 30 years old and was much cheaper but you get the idea.

Ratchet