Hello all,
I see there is a group buy happening for some ARH Headers. I’m interested in hopping in but I want some advice when it comes to cats. I think I want to go catted long tubes rather than catless. Does anyone know how much the power gains will be affected in keeping the cats? Does anyone run this set up and have a video of the sound? What are 100 vs 200 cell cats? Any advice would be appreciated. Thanks!

 

Your username is very appropriate.

 

i just more came here in hopes of finding a video, I’ve been looking everywhere.

Thanks for your help though! ...

 

From 7-19 RWHP, Dyno Dynamics numbers. 19 is for CA-legal cats.

 

Great, thanks! That’s not too bad.

 

Cats are great for noise control w/o losing the great OE exhaust tone IMO.

 

I will probably get cats then. I dont want it to be too loud like I hear catless can be.

 

100 is not cells, but cells per square inch.
The more cells per square inch you have, more compliant but less flow.
Another thing is the technology, where metal substrate allows more EGT than ceramic.
Another thing is the diameter of the cell pack.
If you can get a 4-5 inch diameter cell pack, you account for the lower flow of the high CPSI units.
And lastly, I think the length of the pack may have an effect as well.
I'm preparing to install a 200 cpsi metal substrate in the Subaru. It's 4" but really short. The vendor is disclosing that it's not compliant in all states. 200 cpsi should be. So it's gota be the length.

 

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