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View Full Version : stock cats to "high flow"

treys_C5
07-17-2009, 06:31 AM
Big difference or no? Power wise that is.
BanditDude
07-17-2009, 12:37 PM
Considering that folks with headers are only picking up a handful of HP by deleting them, I seriously doubt that you would notice a difference.
shocktherapy
07-18-2009, 07:13 AM
I agree with bandit dude.
forumjunkie
07-18-2009, 07:03 PM
didn't see any difference here.
tillys1999
07-19-2009, 07:05 AM
The companies that make the high flow cats do claim a nice gain.
product
07-20-2009, 06:46 AM
Pretty much the same thing just configured differently.
C5inSB
07-20-2009, 10:07 AM
Big difference or no? Power wise that is.

There's more to consider than the flow...

Simply put, the high flows will not do their job as long as the factory units. The do not contain as much material (which burns off over time) as the stock units. You may find you can no longer pass smog inspections after a couple of years.

The price difference tells all.
crazy8s
07-20-2009, 07:01 PM
You don't want to buy another set of stock cats!!!!
Sir Drives2Fast
08-02-2009, 09:29 PM
You don't want to buy another set of stock cats!!!!

I got a set of American Racing Headers from ECS that came with the high flow cats, and noticed a big difference, but have no way to tell how much was just the cats. No problems to report as of yet, but emmissions inspection isn't due for another year ...
bloodline
08-03-2009, 08:19 AM
I got a set of American Racing Headers from ECS that came with the high flow cats, and noticed a big difference, but have no way to tell how much was just the cats. No problems to report as of yet, but emmissions inspection isn't due for another year ...

Do you think you will pass?
C5inSB
08-03-2009, 09:05 AM
Do you think you will pass?

Even if it passes the emission test, it might not pass the visual inspection.

They are required to visually inspect for modifications in California and you need to present certificates for parts as I understand it.
tillys1999
08-04-2009, 07:27 AM
Even if it passes the emission test, it might not pass the visual inspection.

They are required to visually inspect for modifications in California and you need to present certificates for parts as I understand it.

That has got to be the most idiotic rule, it passes emissions test but then it can fail a visual!!!:rofl:
C5inSB
08-04-2009, 09:33 AM
That has got to be the most idiotic rule, it passes emissions test but then it can fail a visual!!!:rofl:

Welcome to California :thumbsup:
MarxZiesXR
08-04-2009, 01:10 PM
Big difference or no? Power wise that is.

The best solution to this question is a dyno test! Were only looking for a power difference and nothing else. Were not worried about emissions, price, or durability. If we did worry about anything else it should be horse power to dollar ratio:happy0045: