Catalytic converter question

[85silverado]

I dualed out my truck a while ago with a 40 series flowmaster, and it should pretty loud but it's not. I think the cat is quieting it down a bit. Is there anything I can do without messin up my cat? What is the cap at the bottom of the cat for?

[VileZambonie]

Wait you have dual exhaust and only one cat?

[777884chevy]

what's your state's emissions laws? Here in central IL there are none. I have true duals but with glass packs on all my trucks. I have a flowmaster super 40 series on my 91 s10 blazer 4x4 with the 4.3 v-6 and it's plenty loud with just a single exhaust but I had the cat cut off when I had it installed. I guess I don't know what the cat will do for sound as I always have them cut off.

[85silverado]

Yeah all vehicles that come with a cat must have a y pipe unless you put two on and run two pipes.  

[TRUCK6DRIVER]

If your cat has a plug that looks like a freeze plug you have a pellet style cat. That is the most restrictive thing out there. Even if you pull the plug and remove the pellets there is a waffle plate in there that will hold some of the pellets and will restrict the exhaust. Replace it with a ceramic honeycomb style cat. You can get universal ones for around $50-$75.. these will flow better and will help you get some better sound for the exhaust.

RH

[85silverado]

would it be ok to pull the plug and see what it's gonna do, or is it not a good idea.

[777884chevy]

If you run a y-pipe it is a single exhaust no matter if you have dual tips or not and it will never be all that loud. If you have plenty of extra money and have to have a cat get dual cats and grab another flowmaster 40 series and have a true dual exhaust put on it. I would think that would give you the sound your looking for.

[85silverado]

I know I can get my sound with a new cat. I have had other trucks with the Y pattern exhaust and they have had plenty of volume. Just looking to ditch this twenty+ old cat that is restricting my exhaust to get a better sound. Or uncap it and drop some pellets.

[Lt.Del]

as mentioned before, it depends on the type of cat. I have one of those round straight thru cats on my blue burb and b4 i put a muffler on it, she was LOUD!!!

On my 79 big 10, i have one of those flat oval types w/ the plug.  I have no muffler on it and can hardly hear the sound. That type of muffler robs the sound...no need for a muffler at allll.

sgtdel

[85silverado]

I am going to replace it with a honeycomb style cat because this pellet style one sucks. Anyone know where I can get one for 85 1/2 ton for a good price?

[roundedline]

I can get hi flow cats, what do you consider a good price?

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

[VileZambonie]

cgi.ebay.com/ebaymotors/2...2340QQrdZ1

[OKUMA111]

JUST REMOVE THE THINGS!  YOU WANT IT TO SOUND AWSOME   ----   REMOVE THEM!

 

EDIT: PROFANITY is not allowed on this board. -roundedline

Edited by: roundedline at: 5/1/06 11:26 am

[VileZambonie]

Yeah just help poison the air you and I breathe to live and help ruin the environment so your truck will sound louder! Great advice!  

[777884chevy]

actually we're all doing our part to poison the air and drive up gas prices and what not by driving these old v8 trucks but we love em. Now if I can just convert a 95 geo metro into a truck lol.