Hey Wagon Joe, I'm actually going to be welding a high flow cat where my resonator is. I'm currently catless and my wife doesn't like the smell... she also doens't know I'm totally catless... she wouldn't like that. So I bought a carsound highflow cat on ebay for $35. I don't think there will be a problem putting it where the resonator is. The 3rd factory cat was right in front of it (before I removed it) so I don't think there should be any problems with it getting hot enough. All I care about is it reducing the smell a bit. And then I can just put the factory third cat back in for emmissions.... (I've got a stromung dp and 3rd cat eliminator). By running a high flow cat in the midpipe as well as putting the stock 3rd cat back in I would think you would be able to pass emissions easily, without having to deal with swapping downpipes. Anyway, I should have it done by the end of this week and I'll let you know how it goes.

Also, If you want to run a cat you would probably get the least performance loss by putting it as far from the turbo as possible, so the midpipe makes sense for that.

 

Wagon Joe, I just got my carsound high flow cat welded into my midpipe. My midpipe was a 2.5" custom job with an aftermarked resonator where the stock one was (I used to have a loud muffler so my wife made me get a resonator and then she made me ditch the muffler). I had that cut out and the cat put in. I think the cat is actually less restrictive than the resonator was (the inside diameter of the resonator looked like it was less than 2"). It seems to flow better now. But the best, and most important, part is that there is absolutely no stink. It smells (or rather doesn't) like it did when I was running both oem cats. I bought the carsound cat on ebay for $35. It has a 2.5 inch inlet and outlet and is exactly the same as the magnaflow cats (except cheaper). It also has a heat shield on the top half. There is nothing important over the cat anyway.

If you wanted to make a whole new 2.5" midpipe it would only cost you about $90 ( $55 for the pipe and labor and $35 for the cat), that would be using the stock flanges and cutting out the stock pipe. If you wanted to retain the stock midpipe and put in a 2.5" cat it would be even cheaper, probably $55 total.

So in conlusion, it works great. I'm very happy with the result and the cat works perfectly. And since I have a stromung dp and 3rd cat eliminator all I have to do is swap in the stock 3rd cat and it will easily pass emmissions.

hope this helps.

 

Nope, no smells and the carsound cats seem to flow really well. I think you'll be pleased.

 

Yeah, try a smaller custom shop. They'll usually weld just about anything. Are you planning on having the cat welded to the pipe while it is mounted to the car? I assume you are since your pipe replaces both original cats. I don't know what the laws are like in SLC but here in CA even the custom place wouldn't weld the cat to the pipe while it was on the car. The owner wanted to (a buck is a buck) but in CA it is illegal (with a hefty fine) to weld an aftermarked cat on a new car. So I just removed my midpipe and he was happy to weld it into the pipe. How lame is that.

If you do have to take off your dp for the job make sure you construct a sturdy woodent brace that bolts onto both ends of the pipe so that when the pipe is cut they can maintain the original flange orientation and fit.

Anyway, you may not have to deal with that nonsense in Utah.

Good luck