Getting a cutout

[AZ3.8Camaro]

Ok heres a few questions first. I will be using it at the track only.
1) If I get a cutout put before the cat, will I need an o2 simulator?
2) The pipe before the cat is 3inch correct?
Thats about it. Thanks.

[redbird00]

1) yes o2 simm is needed
2) nope im pretty sure the pipe is 2.5"

merlin

[AZ3.8Camaro]

It looks pretty large for 2.5 inch? Anyone to verify?

[strobhen]

I *think* the pipe is 3", I *think* our cats are 3" in 2.25" in out.

But I do not know for sure

But, if noone else knows for sure either, then:

pi*3 = 9.42
pi*2.75 = 8.635
pi * 2.5 = 7.85

Measure the circumference of the pipe, and if its close to 9.42", its 3", if 7.85", its 2.5", etc.

Not the most accurate method in the world, but you have about an inch of wiggle room in the circumference, should be good enough.

Use some string or floss or something, mark/cut it, and measure on a ruler or tape measure. I don't think a tape measure would wrap around well enough for it.

Later

[AZ3.8Camaro]

Welp, if nobody knows, I guess Ill just do that strohben. Thanks.

[hawgs]

our cats are 3" in im positive

[AZ3.8Camaro]

If I only use the cutout for nitrous, where should I put it? Any Ideas?