I just recently got a flowmaster 80 series installed on my 93 z28. To enhance sound (and performance) I would like to take the catalytic converter off. I have seen so many rides on this forum have it done. I just am not sure exactly how everyone is doing it. I would like to shove a pipe (2 1/2 or 3 in) inside my cat and then just reweld it to look like i have one but i am not sure if that would fit or work.any tips or suggestions would help. I heard someone say if i just gutted it there would be a droning noise in the car above passenger seat because of the open space in the cat.

do 93 z28's have 02 sensors after cat or just before?

 

get rid of it all together if you don't want the cat. I have read that leaving it on can cause turbulance because of the large space the cat would have if it was gutted. Its a lot easier to just weld a pipe in there.

 

Get rid of it completely no point in gutting it.

Edit: BTW it sounds absolutely amazing with LT's and no cat.

 

yeah i agree just take it off and put a pipe in the place, i just found a local muffler shop and paid him cash under the table to do it

 

Dude at my local inspection station (Raleigh, NC area) said that "even tho NC no longer requires emissions testing of OBD1 cars, there is a visual inspection.... and I've got to check for cats"...

So.. I'd like my ride to look like the cat is there, but be "gutted"...PITA I know, but that's what I'm stuck w/...

procedure to do this?

thx

JT

95Z minor bolt ons.. and free mods

 

Hey, just get it flanged on each end and have a piece of pipe flanged so you you can bolt the cat. up for inspection and have the straight pipe when your not being inspected. This is what I did but with the flowmaster 80 and no cat. it makes a annoying poping soung around medium (and up) throttle acceleration. I have heard that you can put either a borla or a dynatech race muffler on your straight pipe and it will get rid of the pop but I haven't had a chance to try it yet. O and make sure you so the muffler shop cash when hes deciding on a price.

 

Right now I have a gutted cat with a Mac headers and a Hooker catback. I have mine on there for any possible roadside visual inspections. BUT I put flanges on it to remove & install a highflow quickly for my next inspection in 2 years! LOL I have NO vibrations or anything in mine, it just sounds wicked!
Mike

 

Open up the cat and weld a tube in it, then weld it back together. Do it through the top of the cat so that nobody at a glance can tell you've been into it. The cat will look like its still there without the air disturbance of having a big reverse venturi in the exhaust which simply gutting it will do.

This just so happens to be my little project for today on mine

 

Got rid of my cat today, sounds a lot meaner/louder now. Only cost me $ 42 too. Luckily I don't have to worry about inspections in Kansas.

 

Roadside inspection in nj? Never heard of one.

 

Get rid of the cat. A gutted cat sounds like ***.
I don't think those pictures are big enough.

 

Bring your stock cat to a metal recycling facility and they'll give you $40 so total cost for you will be $2.

 

I put a 16" dynomax bullet muffler in where my cat goes. With the fittings I can switch between the bullet and the cat in 20 minutes.