How to: Make your test pipe look like a CAT

Nismo1997 · 11-24-2006, 02:09 PM

Tools used:

1/4" drill bit
Chisel
Hammer
Flat head Screw driver
Mig welder
Vise Grips
Grinder

Items needed:

Test pipe
Stock Cat

1) With the cat out of the car. Take the cat and grind the welds on each seam down. Then drill out the weld at each corner of the heat shield(the weld is the bronze/rust looking circle.

2) Pry the heat shield and grind until you break all the welds free and have both halves of the heat shield off.

3) With the test pipe still on the car take the heat shield and mark where you want it to be. Orientation is important to keep heat shield away from drive line.

4) Tac weld one side of the heat shield to the test pipe.

Picture of how it should look so far

5) Get 4 small nuts and bolts together a little smaller or equal to the 1/4" inch holes you made. put those through the holes and tighten down. (don't forget lock washers)

Then tac weld the heat shield together.

Test to make sure your welds are good.

Then Enjoy the highest flowing cat on the market.

STRATTON · 11-24-2006, 02:12 PM

good sh*t bro.

stratton.

codyace · 11-24-2006, 03:10 PM

Certainly cleaner than beating the hell out of that honeycomb stuff inside of them!

TUNED200 · 11-24-2006, 09:53 PM

nice work

CleanSE-R · 11-25-2006, 11:37 AM

NICE work!

blurr.rt.by.you · 11-25-2006, 12:27 PM

Quote:

Originally Posted by codyace

Certainly cleaner than beating the hell out of that honeycomb stuff inside of them!

i tried that and gave up within 1/2 hr

nismo94tuner · 11-26-2006, 11:20 AM

Nick work. I think I'm going to have to do this for mine with my old cat.

tHe iLleSt RiCe · 11-26-2006, 11:37 AM

clever...foolin the CA cops into thinking you have a cat!

Redline SER · 03-28-2010, 08:13 PM

I had a extra bad Cat. laying around so i just pop it and it works great

tme812 · 03-28-2010, 09:46 PM

Or you can try what I did before if you really need to fool someone and it look REAL.

I just cut the in and out of my old cat to 3" (size of my exaust), gutted the insides of the cat, run a piece of 3" stainless through the freshly gutted cat shell, then weld the ends. Voila. You can even weld flanges at each end. Heck, maybe with a temp lean tune you may still be able to pass the sniffer too. Don't have the stiff regulations here, so I don't have to worry about passing emissions. Haven't run a cat for years.