Hey Al,
I have a quick question, I have the dynoflash and I got it done with a factory cat on my 3 inch turbo back. Now I want to buy a 3 inch hi flow cat. I have heard that sometimes they can trigger the censor. What I am wondering is if the dynoflash will prevent the censor from coming on, and if not and I put it on will I have to be reflashed do to the increases in air flow. Is this a good mod?
As always thanks for your help Al, Dynoflash is the sh*t!
Dave
p.s. the new flames look sweet!

 

YOu won't get a CEL with the cat. If it was a test pipe, then the posibility would be there.

 

Any 3" high flow cat will cause possible and ocassional CEL's

Dyno Flash does NOT fix emmissions related cel's - sorrry

I do not think the extra air flow will significantly alter your tune

I sell the UR high flow cat for $149.99 if you want one of those

I love the 3" high flow cat - i run one on my own car

 

While we are on the subject of high flow cats I have a 2.5 downpipe and stock exhaust with no muffler....should i get the 2.5 in cat or 3 in??

 

2.5

 

I can atest to this.
My SES light came on while driving home from getting DynoFlashed/tuned.
The combination of the good tune and the UR 3" cat allowing so much exhaust to flow that
the rear O2 sensor cried foul and threw a flag on the field.

Had the code pulled - P0420

Added the spark plug anti-foul adapter, as found in another thread, and no more SES.

 

Good idea on the spark plug anti - fouler - that would be great

Can you post up the link here ?

 

Here is the thread:

https://www.evolutionm.net/forums/sh...threadid=62524

Look down the first page for Derekw's post.

A big thanks to Derekw