WTB Cat converters for 2.5L - 986 Forum - The Community for Porsche Boxster & Cayman Owners

911monty · 09-01-2019, 09:59 AM

Just had Calif smog done. HC's are up so I'm going to start looking for some low mileage Cats while I have time. If you have some or know where to find some let me know. I have a 98 for reference. Thanks

maytag · 09-01-2019, 11:38 AM

Quote:

Originally Posted by 911monty

Just had Calif smog done. HC's are up so I'm going to start looking for some low mileage Cats while I have time. If you have some or know where to find some let me know. I have a 98 for reference. Thanks

I have a couple sets from 3.2's. Are they compatible?

Sent from my SM-G970U using Tapatalk

JimmyBad · 09-01-2019, 12:05 PM

Stock exhaust manifold catalytic converters

I’m not sure if these would bolt on. I know these are high mileage but they were working fine when I removed them and they should still be good to go. We can adjust the price to that.

911monty · 09-01-2019, 12:13 PM

Quote:

Originally Posted by maytag

I have a couple sets from 3.2's. Are they compatible?
Sent from my SM-G970U using Tapatalk

Thanks for the reply. Unfortunately don't think so.

Quote:

Originally Posted by JimmyBad

Stock exhaust manifold catalytic converters

I’m not sure if these would bolt on. I know these are high mileage but they were working fine when I removed them and they should still be good to go. We can adjust the price to that.

Unfortunately these are for the 3.2 S model with the cats in the headers and will not pass Calif smog.

maytag · 09-01-2019, 03:58 PM

Quote:

Originally Posted by 911monty

Thanks for the reply. Unfortunately don't think so.

Everything I'm reading says they are. The secondary cats on the 3.2 seem to be identical and interchangeable with the 2.7 and 2.5. At least according to parts exchange sites.

Woody? Or David? Y'all know about this?

Sent from my SM-G970U using Tapatalk

911monty · 09-01-2019, 04:31 PM

Quote:

Originally Posted by maytag

Everything I'm reading says they are. The secondary cats on the 3.2 seem to be identical and interchangeable with the 2.7 and 2.5. At least according to parts exchange sites.

Woody? Or David? Y'all know about this?

Sent from my SM-G970U using Tapatalk

Well Hope I'm wrong, but the pre cat 02 sensor on the 3.2L cars is on the header ahead of the convertor. So the mid pipes would only have the after cat 02 sensor, where the 2.5L cars have the pre and post 02 sensors on the mid pipes. Hoping to find the 2.5L pipes so I don't have to modify. Might have to sometime but that's why I'm starting the search early! Of course I may be wrong.

JimmyBad · 09-01-2019, 04:58 PM

Quote:

Originally Posted by 911monty

Well Hope I'm wrong, but the pre cat 02 sensor on the 3.2L cars is on the header ahead of the convertor. So the mid pipes would only have the after cat 02 sensor, where the 2.5L cars have the pre and post 02 sensors on the mid pipes. Hoping to find the 2.5L pipes so I don't have to modify. Might have to sometime but that's why I'm starting the search early! Of course I may be wrong.

The manifold that I have from the 2.7l has bungs for both pre and post o2 sensors. I don't think I have any o2 sensors plugged into the mid-pipes. Your setup might be different as you may have both pre and post o2 sensor on your mid-pipes like you've said. I'm not sure if your manifold is monitored but it seems like you're looking for 2.5l mid-pipes anyways, similar to the picture below.

maytag · 09-01-2019, 05:16 PM

Quote:

Originally Posted by 911monty

Well Hope I'm wrong, but the pre cat 02 sensor on the 3.2L cars is on the header ahead of the convertor. So the mid pipes would only have the after cat 02 sensor, where the 2.5L cars have the pre and post 02 sensors on the mid pipes. Hoping to find the 2.5L pipes so I don't have to modify. Might have to sometime but that's why I'm starting the search early! Of course I may be wrong.

You're probably right, but when I hit the garage tonight, I'll take a look and see what sorta bungs exist on these.

Sent from my SM-G970U using Tapatalk

911monty · 09-01-2019, 05:24 PM

Quote:

Originally Posted by JimmyBad

The manifold that I have from the 2.7l has bungs for both pre and post o2 sensors. I don't think I have any o2 sensors plugged into the mid-pipes. Your setup might be different as you may have both pre and post o2 sensor on your mid-pipes like you've said. I'm not sure if your manifold is monitored but it seems like you're looking for 2.5l mid-pipes anyways, similar to the picture below.

Yep just like that. Both bungs are on the mid pipes as in the picture, Thanks for that.