Stock cat?
 

Does anyone know what the smallest diameter inside the stock cats? I was wondering if the old soak them in kerosene and light them on fire until the insides crumble and fall out to make better flow would work? Just a thought...

Are you serious? Lol

:iagree: Test pipes are $100....why not just buy a set instead of making your own out of something you may need to use in the future lol.

you spent $30k+ on this car, please please please do it right and buy high flow cats or test pipes. I dont understand peoples need to half *** things. If you cant "afford" it or what ever, wait till you can or its in budget so its CORRECT

You know what... It's not a bad idea if Maine has REALLY strict smog laws, but doesn't do a sniffer test, but I somehow doubt that and I think the OP is being cheap, lol


OP, if you really want, give me $40 and your stock cats, I'll give you my resonated test pipes

Yeah, actual test pipes will give you better gains, sound better, and save weight. Plus, if you look in the for sale section, you'll be able to find used test pipes (often resonated) for under 150.

I'm not cheap, and i can def afford pretty much what ever i want to do with the car. I was just wondering if anyone has done this or heard of doing this on a Z. Its an old school trick i heard about, and was trying to see if it was just ********. Maybe i should have been more exact with what i said...

Never heard of this and I'm pretty sure no one has done it on their Z on this forum. Get yourself some good test pipes might I recommend Fast Intentions.

To be honest not something most would do as the feedback you've gotten already, But if you want to do that? Thats your discretion.

I would use a metal pole to bust out the ceramic honeycomb it should take you about half an hour to get it done.

I did it on my 350z. Not the way you are mentioning, but I did gut them. Its all the advantages of test pipes without the rasp and passes a visual inspection. I did it because my supercharged engine had a misfire and burned one up anyway, so I wanted to see how they would perform.

This sounds crazy.. but pretty cool.

No rasp on mine ;)

Momentum headers, Top Speed resonated test pipes, CNT Exhaust

http://i184.photobucket.com/albums/x...8574254970.jpg

Probably helps that test pipes are resonated, exhuast has 18" resonators and muffler canisters like the HKS exhaust lol.

I don't have rasp on mine either, and I'm straight pipes all the way to my two tiny glasspacks, but I don't operate my car below 4000 rpm, ever.

:bowrofl:

Just go with a testpipe. Eventually you will need the stock cats again to pass smog.

I knocked out the cat on an uppipe for a Subaru I had. Worked fine. I don't see why you would have any issues. Personally, I'd get a long screwdriver or a piece of rebar and hammer it out rather than using fire. It may be easier to get a long drill bit and poke some holes in the cat material to make it break up easier. Make sure you get it all. Wear a mask. The dust is nasty stuff, and you don't want it in your lungs.

This thread makes me grin.

Many years ago I gutted the pre-cats on my VR-4. With them on the car.

I got under the car, used a half inch auger bit and a power drill. Drill drill drill, yank some crap out with long needle nose pliers, drill drill drill.

I was washing catalytic converter out of my hair and skin for days.

I wouldn't recommend that method to anyone ever hahaha.

Wow. Doing it on the car is pretty ballsy.

They were completely rusted to the turbine flanges. I'd have to take the turbos off of the car, probably the manifolds themselves, to get them off of the car to get the bolts drilled out and blah blah blah.

I'd just done a clutch job on the damn thing that took me 3 days of hard labor to get done. I couldn't afford labor anywhere else and I knew I'd probably never get the turbos out without professional intervention.

That car was a real bitch to work on. Traverse mounted twin turbo V6's FTMFL.

Also, you should have seen the cloud that came out of the car when we started it up afterwards. Was pretty awesome.

By the time I was done, the cat housings were completely empty. Spool was much better, sound was ridiculous. (Already had a test pipe in place for the main cat, and the Borla exhaust I had was ridiculously loud)

You're a braver soul than I to have owned a VR4. A buddy of mine had one that ran really well. When it ran.

Ain't that the truth!

I had a gen 1.5, meaning a 1993.

5 Speed super long geared tranny, forged everything in the engine (as opposed to the 91-92's with cast stuff) but still had the shitty aluminum transfer case.

I ended up cracking the transmission housing @ the transfer case. Instead of snapping the T/C like everyone else did, it cracked the transmission's case, spilling gear oil everywhere.

Then I sold it.

The happiest day of any Mitsubishi owner's life.

oh yeah, wear a respirator, or at the very least a dust mask. There are some pretty nasty heavy metals in there.

Quote for truth.

LOL! :rofl2: Did you try this? It might work if it got hot enough?? I know the red nek way around here is to remove 'em and take an acetylene torch to 'em. -Bonus points if you do it under the car w/'em still attached! Guts 'em really fast! :tup:

No, a did long tube headers