Thread: How to: Make your test pipe look like a CAT

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.
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)

Picture of how it should look so far


Then tac weld the heat shield together.


Test to make sure your welds are good.

Then Enjoy the highest flowing cat on the market.
[/QUOTE]

VERY slick.

^ X2.

Nismo1997, you should show us how to weld on a bolt for the O2 sensor

There is a beter way to do this Nismo.

Get a Cat, gut it out, then get a pipe that is 1/2 shorter than the cat. Put it inside the gutted cat. Then take it to a muffler shop and have them swedge the ends so that it is tight. Maybe have someone tack weld the ends in and wala. Cat flows free.

This method is only good for up to 2.5 inch.

If you need 3 inch, go Nismo's way.

Does the heat shield make any rattling noise when driving hard/full throttle?