I'm not trying to change your opinion on this but have to say it seems contradictory to speak of the R&D that goes into the Factory Cats but then for the most part suggest folks go Catless and run resonators. Maybe I took something out of context or misunderstood your point and if so I apologize.
This is just me personally, I have a hard time swallowing that the factory cat is so much more highly R&D'd over a company that specializes solely in producing performance products that exceed manufacturer specifications. Keep in mind GESI isn't just a name, it stands for "Global Emissions Systems, Inc". All they do is design, development, and manufacture emissions control products for the past 20+ years..
It wouldn't surprise me to learn that GM outsources the stock Cats to the lowest bidding supplier they can find with some sort of financial protection warranty for them in place if suddenly they all start failing. I highly doubt the stock cats are any competition with a GESI cats.
Check these out: Vibrant Performance
Part Specifications
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Inlet / Outlet: 3.00"
Converter Body O.D. - 4.50"
Overall Length: 7.00"
Engine Limit Per Bank: 500-850HP
Substrate Cell Count: 300 cells / inch^2
GESI High Output (HO-series) and Ultra High output (UHO-series) Universal Metal Core Catalytic Converters have been designed to provide a reliable solution to the most common converter problems experienced by our customers.
- EPA certified for use on OBD2 vehicles (1996 and newer). 49 States only!
- Full Stainless Steel construction, including the substrate which is furnace braised to the mantle for outstanding durability
- Unique end-cap design locks substrate in so it can't rattle around
- The GESI proprietary precious metal loading technology ensures greatly reduced emissions, eliminating most "Check Engine Light" issues
- Capable of withstanding up to 1500 deg F
- Ideal for forced induction applications, with no loss of HP
- Covered by a 5 y
https://youtu.be/56oLVgpwOAs
I don't track my car and with as heavy as traffic is around me I'd be lucky if I can find a long empty on-Ramp that I can open it up on once in a while so I'd say 95% time I am not beating on it. I just want to reduce or eliminate the awful gas smell and if possible reduce the drone some. I am confident a company like Vibrant makes a quality product and even backs it up with a 5yr warranty that it'll just work out fine.