El Commandante

Does anyone know which high flow cats will fit on an 86 NA for a decent price? I'm looking to replace the factory cat.
Sorry, I'm not too informed in the exhaust department.

Thanks in advance

Weston

You can get Carsound high-flow cats off of eBay for $55 shipped. Just order a cat for the right diameter of pipe (my stock '83 exhaust appears to be 2 1/8"), then take everything to an exhaust shop or a friend with a welder. The stock cat is pretty long, so it will require adding some pipe to the new cat.

Tabor

Yea, I used a carsound on my Volvo, but I don't know what diameter you need for your Porsche (mine is not here to check).

El Commandante

do they change the sound of the car in any way?

EDIT: and i forgot, do you measure the diameter of your exhaust pipe from the inside or from the outside?

Thanks

Porschefile

The stock non-turbos are all 2.25" IIRC, and Turbos are 2.5" stock. There wouldn't be any reason to go larger than 2.5" on an n/a 944.

GodSpeed

I think magnaflow make a drop in cat.

David Boutelle

i have 4 porsche 944es . the 3 - 944 na with a 2.5 L uses a 2 inch ID D.O.M. oem pipe and the 16 valve 944S uses a 2.25 ID pipe . on my 84 944 i installed a magnaflow high flow cat. part # 54304 with shipping it was 82. dollars from jegs.com . I D - inside diameter , D.O.M.- drawn over mandrel . you will feal little to no gain in horse power because the oem cat. is a high flow cat. i think it was , from when i cut my 944 cat in half i counted 32 cells per inch and the one i cut in half off a honda accord was 56 cells per inch . that was a long time ago .but the less cells per inch the more flow you get . cats will have one of 2 cores . a platinum core or a ceramic core ether one is fine for your car, if an every day driver.the cat installed on my 944 did not change the sound it all .

David Boutelle

i should add that if your cat is braking down and starting to rattle than some times the little peaces might start to clog the muffler too.

El Commandante

Thanks For all of the Info.