zzzwilliams3200

Can I punch out the baffling in my 93 Maxima SE's stock catalytic converter? I have heard of it on trucks and stuff but I was wondering if it would give better performance to us as well...
Would any ECU problems occur with this mod? Thanks in advance,

Zach

Jeff92se

iTrader: (82)

If your cat is good condition, don't touch it. I still might have my spare gutted cat if you want it. Cheap!

zzzwilliams3200

How much do you want for it?

keener

Catalytics are spendy, so I suggest you pull the converter and simply put in a test pipe. This way you can put the catalytic back on for emission testing.

MaximaBalla

That's what I did. I noticed a huge difference in gas mileage and I noticed a slight power difference, it sounds just a bit louder, but, it smells sooo bad!! lol

acidspit86

performance up or down?

maxinmaxima

iTrader: (2)

gas mileage up or down? i'm welding a piece of pipe in, in place of the cat on my winter max tonight.

I don't have emissions tests where I live

Kevincleff

iTrader: (3)

I dont think it is supposed to smell bad, that is usually when you have a bad cat!

subs1000w

it dont smell any different

Matt93SE

iTrader: (44)

Mmmm misinformation abounds yet again.

Michael

iTrader: (21)

What MaximaBalla is probably smelling is his car running rich. I know my car did that when I took my cat off.

I think I have a leaky injector though but not sure since I dont think I notice it until I took the cat off. I just "figured" that the ECU over compesates for the free flow of exhaust and was pouring the gas to the engine. I havent tested my injectors yet but that is one of the things I am going to do when I replace my VTCs.

I already replaced my O2 sensor and TPS for other reasons and that didnt fix it. I replaced my water temp sensors too because I know that can make the ECU think the car is running cold which will feed more fuel too.

MaximaBalla

Yes, my car IS running rich. It's simple, once you take off the cat., all of the gases that the cat. normally burns off are also being expelled out the exhaust, hince the reason why it smells so bad. Yes, I did notice a pretty nice improvement on gas mileage and power.

Since when have I given wrong infomation Matt? I think I know what is going on on MY car?

Michael

iTrader: (21)

No its not supposed to do that...there is something wrong. I have had plenty of cars that didnt have a cat and they didnt run rich or smell bad.

I believe that I have read on here that raw fuel would ruin a cat.

MaximaBalla

So, what could be my problem then?

internetautomar

iTrader: (30)

Raw fuel will cause the cat to get plugged because it melts (?) the brick into a solid Mass and thereby choking the engine to death.
A properly functiong engine with a proper converter will see NO gains by removing the cat.
one with a problem will see some gains.