Anyone here has B&B headers & cats (installed)?

After some time of running the B&B exhaust now, I am thinking of adding their headers & cats as well. What holds me back from doing it right now is actually the installation part and the risk of running into some issues… Their cats (German made HJS 100 cell) are sitting basically right in front of the muffler as you can see here: (The position is also very similar to the second pair of cats welded to the original factory muffler) (Cats not welded to their headers!) Now, the tricky part, the O2 sensor cables must be pulled/extended to this location! How is that possible? Are the cables long enough? Anyone here done it, or seen how it was done? Many thanks in advance! Cheers!

Here is some info you should know. Those long run headers will make less hp than short run headers but may make more torque. Not having the cats in the headers means you have to relocate the O2 sensors. This is no small task as neither wiring harness loop will stretch that far, that means you have to make your own harness. It also means that harness will be routed in and around hot exhaust and engine components. If done right it might be fine, but it will be a pain in the you know what and for no good reason. A shorter run header with cat in one unit will make more hp than a long run header and later cat, albeit may not make as much torque but you'd have to test to see. If you are already running their catback without cats don't you have to throw away some of your existing catback and replace it with cats or did you order the catback with cats previously? Did you dyno your car before and after the catback? If so, what did it do to it?

Yes, I am aware of the difference between long vs. short headers. This is something to really test in practice… I somehow like the fact that their cats are sitting further in the back. I think the risk of burned out cat cells will be reduced. At the same time I am hesitant to accept the fact I have to extend the O2 sensor cables. I was told it works (by B&B) fine and they and others have done it many times. But I would like to actually hear from someone who really did this and what had to be done exactly to successfully run this set-up. As for the exhaust, I have the cat less version. No, I have not done before and after dyno runs… In order to add the cats now I would just exchange the tubes attached to the mufflers, that’s all (the picture is misleading, there is an additional connection!). Cheers!

I've extended O2 sensor harness (3 wire type) on a couple of cars after installation of LT headers. Are the Porsche O2 sensors different than a typical 3 wire sensor? If not, its pretty easy to cut, splice, and solder to extend the O2 sensors. As point out above, you have to route the extended harness such that it is not in contact with any part of the exhaust. Unless there is something unique about the Cayman sensors, I wouldn't let extending them hold you back.

Info I received today: "To reroute the O2 sensors to reach the new location is remove them from all the frame clips that are currently being used to hold them in place for the stock location. There willbe enough length to reach the new position in the pipe." Can anyone confirm this? Thanks!

I have the headers and exhaust. There is, in fact, enough wiring to reach. No big deal.

charles06, welcome to the Cayman Club! I assume you also have the cats installed? Would you mind sharing who installed the system for you? (You can private message me) Many thanks!

I have the system that eliminates two of the four cats. They were installed by a place called Ultimate Audio. Yes, it's a stereo shop, but they do a lot more. Great people. If you name a car, they have worked on it. Not sure if this helps, though, considering I'm in Orlando. Oh, and by the way, although Billy Boat advertises no resonance, there is some around 3000 rpm's after the car has warmed up. Sometimes, it can be very annoying. I just stay in the gear longer. The sound, otherwise, is awesome!