Do Flow Test Exist for Stock Cats?

[xl_cheese]

I've searched and cannot find any data regarding the CFM of the stock cats. What makes me curious whether high flow cats really do something is due to the size. The stock cats are much larger than any aftermarket. So even though they have a higher density, the larger diameter could offset any restriction. The bottle neck could just be the smaller size inlet/outlets on the cats.

It seems feasible to modify the stock cats to have 3" in/out size pipes then run those with long tube headers.

Could be a fun experiment. I still have my stock manifolds up in the attic.

Stock cats have a size of 6" whereas highflow aftermarket cats are 4". This is stock area of 28.27in ^2 vs aftermarket area of 12.57in^2. Even if the density is twice the value in stock they'd still flow more air.

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[GregO]

@xl_cheese
Good to start here;
https://www.mustang6g.com/forums/threads/exhaust-pressure-testing.162791/

 

[xl_cheese]

@xl_cheese
Good to start here;
https://www.mustang6g.com/forums/threads/exhaust-pressure-testing.162791/

Ah, that is a good thread! I recall reading it a while back when looking at adding a resonator. I did not remember he removed te 2.5" pipe after the stock cats.

Would be cool to see what this looked like finished up!

https://www.mustang6g.com/forums/threads/exhaust-pressure-testing.162791/page-5#post-3436153

 

[K Myers]

If cats aren't required why run them just run 3in system all the back

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