Just out of curiosity, has anyone just changed the cats and not the mufflers? I know it would be best to change the headers, cats and mufflers but I was wondering if anyone has just done the cats?

What were the results? Did you get a different exhaust tone comparable to just having aftermarket mufflers?

Would there be negative effects to doing this?

 

Tons of guys do just sport cats.

 

Do some headers too. At the very least the E-bay/suncoast headers or the X-51 headers. The stock headers are a very poor design IMO.

I have a set of E-bay headers cheap. PM me if interested. The only reason I took them off is because I found a complete AWE system used.

 

What did you think of the eBay headers? Did you notice an improvement over stock?

 

Yes. The noise changed slightly and the top end was definitely better.

If I remember correctly the primaries are the same as stock and the collector is about 10mm bigger in dia. than stock.

And they eliminate the resonance in the cab that I found in 6th gear at highway speeds.

 

Yes, stock mufflers, x51 like headers, and AWE cats. very nice setup.........But a little loud for my neighbors and the wife.

 

Fabspeed cats, ebay headers, and stock cans.. It sounds the way it should of come from the factory . Its also quiet in the cab at hwy speeds.

 

I am running a system like you are asking about. I am having some issues with the AWE cats, but they seem to be dealing with it.

 

With 100 cell or 200 cell AWE cats or?? Thanks..

 

200 cell, but they are the previous generation, made in 2006.

 

I have 200 cell AWE Cats and headers with PSE...Love them you can keep it some waht quiet with pse off or make it load by turning it on

 

Northvan, what seem to be the issue? Has it been an isolated case or has there been several cases like the one you are having?

 

Had a 95 993 with cat by pass pipes and stock muffler. Perfect sound for me!! Not to loud just loud enough to here air cooled bliss. I am from FL so i have no emissions probes stuck up my Pcars a X2 = s every year. Lucky me. Never have tried it on my 997 s (yet) tried the muffler by pass NO thanks.

 

The people at AWE are aware of this problem, and upgrade them for a fee to the new ones, I am getting a CEL after 4000 miles without problems. Dealer says the two sensors are reading different air flow rates from one to the next. It is easy to reset and stays away for a few days and then comes back. Doesn't effect performance, just a PIA.

 

I have the AWE cats and the X51 headers, love this combo. A great upgrade and worth the money.