PHX 911

Dunno...
The muffler is insulated from both the engine on the inside and the bumper cover/apron on the outside, with foil-type insulation.
There's quite a bit of insulation back there, actually.
Ceramic is cool, though, so do it for that!

Jasper1

Any C2 997.1 Cab owners out there who did the Gundo hack? Happy? Unhappy? Just curious because with the top down the Cabs have a more pronounced sound than with the top up (part of the reason I bought it !!)

Spokane5150

My buddy has a C2 Cab with the Gundo and I was so jealous that I had to get mine done. They ship tomorrow from FD Motorsports. I got the chrome ceramic coating with 1.75" bypass. They should look and sound awesome. I'll post some photo's when I'm done.

wanderingwheelz

Okay. Today I installed (about a 3 out of 10 in difficulty) my FD Motorsports hacked secondary mufflers. In combination with my Sharkwerks primary muffler bypass pipes the sound is simply incredible. Even my skeptical 15 year old daughter told me the sound is " bad ***". Don't even think twice- do it ASAP.

Spokane5150

What is this Sharkwerks bypass. Is it for the 997.2?

wanderingwheelz

The Sharkwerks cross pipes are designed to eliminate the primary muffler on a 997.2 car. The primary muffler is the sort of cylindrical shaped muffler that is behind the license plate in the center.

The 997.1 cars do not have that muffler. It was new for the 2009-2012 cars.

vern1

I have the gundo on my 997.1 C4S and its great. Best sound mod at a low cost. PSE sound at a fraction of the price. Do it

PHX 911

Eliminates the center silencer on 997.2 cars, via use of "X" pipes. This is not the primary muffler btw. Exhaust is routed through the side mufflers first, just like 997.1 cars, then through the silencer and out your tips.

wanderingwheelz

The primary muffler is the 1st to receive the exhaust. It is the one that is bolted to the cats. The larger side (secondary) mufflers are then attached to the primary muffler with a collar. From there the exhaust flows through the side mufflers then out the exhaust tips. I did all of my exhaust work myself so I am very familiar with it!

PHX 911

You're correct - my bad. Your description is the correct routing.
I should have known, as I put Tubi on a couple weeks ago.
Duh....

Spoddle

I have the gundo hack. Overall I'm happy with it. The only drawback is that it can be a bit loud when traveling on the highway for long distances.

wanderingwheelz

If you're concerned about the exhaust being too loud at highway speeds I strongly suggest you have the job properly done by FD Motorsports. A Gundo hack is simply going to have a pipe randomly welded between the two muffler pipes. Darin Fister will do the job properly- 1.75" stainless pipe, welded properly and tuned to be only loud at 3500 RPM and higher. Trust me here- pay a little extra to have the job done right.

Little Green

Just installed mine this morning. 45 minutes once I realized how to take the mufflers off. Sounds awesome compared to stock. Do this if you have not already done this

Spokane5150

The install went well. Be prepared to replace some of the bolts. I actually replaced all of them with Stainless Steel Nuts, Bolts, Washers and Lock Washers from Lowes. Some pictures below:

My new FD Motorsports Muflers:

Spokane5150

Example of Premium Work from FD Motorsports:



Examples of some poor jobs IMHO:







http://i803.photobucket.com/albums/y...che/gundo1.jpg