Circuit Werks high flow cats
 

I see Circuit Werks high flow cats on ebay for $285. The say all stainless steel and 200 cell cats. I don't see any O2 sensor bungs though. Much cheaper than similar Fabspeed units.

Interesting. I have the Ciruit Werks bypass pipes, very happy with them, and they have holes for the O2 sensors (where they are on the 2.5 - my car's a 2.7 so I just sealed them up). I would be surprised if they weren't there with cats, but that's all I can add if the pics don't tell more.

I have the circuit werks cat back exhaust on my and I couldnt be happier with the results

I see what you mean - says they're for 2.7 and 3.2 only (ie no sensor holes). If yours is a 98 (avatar), looks like these won't work unless you have a shop add those holes.

http://986forum.com/forums/uploads01...1421384020.jpg

Yes I do have a 98. I wonder how much a shop would charge to add the holes? A full exhaust with those cats, muffler and headers can be had for under $1000. Interesting. I'm sure my wife will love the idea lol. :barf:

Haha!
Yeah, I have no idea on the fabrication costs, but probably not too much - just gotta cut two holes in the right place in each pipe and weld in the threading for the sensors. Hopefully someone who has had some custom exhaust work will chime in...

How is the drone at 3,000 RPM?

This is basicly true, you do want to find quality SS O2 bungs & a good SS welder. I would go to Burns Stainless in So.CA. You can order the bungs from them too.

No drone here
 

I also have the bypass pipes and have not experienced any drone.