RX7 FD3S OEM Catalytic Converter Gasket Size
 

Hello guys,

Sorry i feal i will have people stating dont post duplicate posts, have seen post on this and people are stating 2.55", 2.5 and 3".

So i have a 1993 Jap import RX7 FD3S, stock exhaust with a Blitz backbox. Its loud and found out my cat is smashed up by last owner. I have replacement OEM coming later this week, what size gaskets do the OEM cat system use please.

Contacted a few sellers on eBay stating 2.5" and when i ask, they state it wont fit.

Also the airpump gasket, what size is this... not that ill be able to find one online.

I am thinking plan B - make my own gasket, Plan C - instant gasket sealer, would like to run with plan A.

the Mazda part number is RF36-40-305 https://www.amayama.com/en/part/mazda/rf3640305

Hi, Thanks for the reply, so im in the UK and this site states End May, Start June for del. haha. Found this uk site, looks to be the correct one, https://www.autodoc.co.uk/hjs/1949867

Do you have a part number for airpump gasket

n3a7-40-307!

I've been using this Vibrant exhaust gasket -


I think if you go on their web page it will have the specs for the bolt spacing and hole size. If that same gasket isn't available in the UK you can use those specs to find one that is.

Some of the OEM gaskets are on the small side, worth having the larger hole size if you upgrade components. Also this gasket is very high quality and reasonably priced.

Dale

Hi, Thank you very much for your help, think i found two.

https://www.ebay.co.uk/itm/264306042082?ul_noapp=true

Contacted the seller and are unsure but OEM part numbers seem ok, worth a try. Ill purchase so gasket RTV also just in case so i can at least drive my car finally, will order the correct ones as when i get it off, can take measurements.