mlemche

My C2 996 is my daily driver and I live in California and have to pass smog. One of my Cats rattles so I need to replace it. I searched on line and bought a Magnaflow Cat. When my Indie tried to install it, he noticed it was 2 inches too short on the muffler side. The overall dimension is 30 inches which they say meets their spec. The attached picture shows the new one lined up on top of the old one. Difference is about 2 inches. Anyone else have this problem? Short of leaving the state I would appreciate any suggestions. Thank you.

dgi 07

1. get a refund and find another manufacturer

2. Weld 2 more inches of pipe to make up the difference.

3. you said it yourself....

Ahsai

Paging kromdom...he had great success with magnaflow cats.

Alternatively send them to Carnewal for a 200-cell cat internal element replacement. No more CEL.

5CHN3LL

Is the cat you purchased CARB-approved for use on your vehicle? If not, your car may still fail smog if the inspector notices that the cats have been modified.

5 years ago, I wouldn't have even mentioned this, but now that both of my "suspected polluters" have to go to STAR stations where they tend to be much more detail-oriented, I could see this actually happening...

It looks like you're pretty deep into this, but for what new catalytic converters sell for, you want to be darn sure your new cats are street-legal.

And yes, moving out of CA is starting to seem like a better and better idea. Eventually, I'm going to have to buy some "Hybrid Synergy Drive" stickers for the 996 so the environazis don't key my car.

Ahsai

Are these the same as what kromdom got in this thread? He didn't seem to have any problems.

https://rennlist.com/forums/996-foru...options-3.html

5CHN3LL

Welding a couple of inches of pipe to a cat that already looks non-stock might catch the smog tech's eye...is all I'm sayin'...

Ahsai

Yes, I agree. Btw, my reply was not directed to your post above.

mlemche

Thanks guys. Magnaflow says that I have purchased the correct, CARB compliant, Cat for my car. I agree that modifying the Cat won't work, but I think I can add a short piece to the muffler pipe to make it work. Sure would be easier to live in another state.....so many more choices.

sweet victory

Magnaflow is the only aftermarket CARB approved manufacturer that sells replacement cats that are "direct fit."

https://ssl.arb.ca.gov/PartsSearchTo...earchTool.aspx

sweet victory

The section of tubing you have to weld on is "after" the cat, thus it remains in its intended location. I would still bitch about it, so that they can issue an engineering change on their end.

Ahsai

There are also longer sleeves like these (you need to find the ones with the right dimensions) that may help.

https://www.ebay.com/itm/2-X-Exhaust...xX8jKq&vxp=mtr

dgi 07

idk brother. I live in NJ. All I have to worry about is my CEL being off and I pass emissions. My daily has had a cracked windshield for 3 years, modified exhaust (resonator removed) and I still glide through every time.

jhbrennan

Yet you can't pump your own gas...go figure.

dgi 07

Dont get me started on that. The amount of times I've had to clear check engine lights for gas cap codes is ridiculous. Started checking it myself every time I get gas..

OP, that sleeve that Ahsai posted may help.

Gert

Looks like these are 997 cats.
These are shorter than the 996 cats.
61mm shorter on one side and 66mm on the other.