1000+ hp catalytic converters?

JSH · 12-13-2025, 09:39 AM

Are these the ones I want?

arpad_m · 12-13-2025, 10:30 AM

Yes, these Gen2s are rated for 850 hp each ("per bank", see here).

L78toLT1 · 12-13-2025, 10:52 AM

Quote:

Originally Posted by arpad_m

Yes, these Gen2s are rated for 850 hp each ("per bank", see here).

Are you still running your original "Green" cats, Arpad?

SOCAL.M6.ZLE · 12-13-2025, 10:57 AM

Quote:

Originally Posted by JSH

Are these the ones I want?

Kind of... for your car you want THESE ones #85230 that are the 4.5" UHO flavor rated at 850hp per cat... PM if you want a $100 off discount code...

arpad_m · 12-13-2025, 11:24 AM

Quote:

Originally Posted by L78toLT1

Are you still running your original "Green" cats, Arpad?

Yeah

So far, so good, though, my car (and yours) probably don't have enough power to destroy them, as those are rated between 425 to 450 hp per cat. I figured I'd upgrade to the Gen2 if/when the engine needs to be worked on again.

JSH · 12-13-2025, 12:14 PM

Quote:

Originally Posted by L78toLT1

Are you still running your original "Green" cats, Arpad?

The internals of my green cats ended up in my axle back mufflers.

JSH · 12-13-2025, 12:56 PM

Quote:

Originally Posted by L78toLT1

Are you still running your original "Green" cats, Arpad?

The internals of my green cats ended up in my axle back mufflers.

arpad_m · 12-13-2025, 01:07 PM

Quote:

Originally Posted by JSH

The internals of my green cats ended up in my axle back mufflers.

Yup, 1045 hp will do that to the Gen1 green cats.

Camfab · 12-14-2025, 03:06 PM

Quote:

Originally Posted by SOCAL.M6.ZLE

Kind of... for your car you want THESE ones #85230 that are the 4.5" UHO flavor rated at 850hp per cat... PM if you want a $100 off discount code...

I was reading about those CATS on your website, look pretty awesome. I’m certain it’s a technical oversite, but it says…. Are these CATS CARB legal, and then it says “YES” then correctly says they aren’t legal in CA. So unfortunately they are not CARB legal.

L78toLT1 · 12-14-2025, 05:44 PM

Quote:

Originally Posted by arpad_m

Yeah

So far, so good, though, my car (and yours) probably don't have enough power to destroy them, as those are rated between 425 to 450 hp per cat. I figured I'd upgrade to the Gen2 if/when the engine needs to be worked on again.

If that 425 - 450hp is measured at the crank, we're certainly at or near the limits.

arpad_m · 12-14-2025, 06:33 PM

Quote:

Originally Posted by L78toLT1

If that 425 - 450hp is measured at the crank, we're certainly at or near the limits.

True, we are very close, hence my tentative upgrade plan

*Joshinator99* · 12-14-2025, 07:25 PM

Quote:

Originally Posted by Camfab

I was reading about those CATS on your website, look pretty awesome. I’m certain it’s a technical oversite, but it says…. Are these CATS CARB legal, and then it says “YES” then correctly says they aren’t legal in CA. So unfortunately they are not CARB legal.

Correct, the GESI Gen2 cats are “only” 49-state legal to the best of my knowledge.

JSH · 12-14-2025, 08:12 PM

Quote:

Originally Posted by Joshinator99

Correct, the GESI Gen2 cats are “only” 49-state legal to the best of my knowledge.

Josh, are you running them?

*Joshinator99* · 12-14-2025, 09:37 PM

Quote:

Originally Posted by JSH

Josh, are you running them?

Negative. Since my car is virtually track only at this point, and am running E85, I have been running my “off road” pipes.

12-13-2025, 09:39 AM	#1
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 4,148	1000+ hp catalytic converters? Are these the ones I want? Attached Images __________________ 2020 ZL1LE A10. LME LT4 390 short block, CID Heads, Kong E2650, FBO. 15" conversion, Nitto 555Rii or MT ET Street R or Toyo Proxes RR. 100 octane: 1045hp/1055tq. 100 octane + Alky MAF Meth (1) 10+:

12-13-2025, 10:30 AM	#2
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 13,150 View My Garage	Yes, these Gen2s are rated for 850 hp each ("per bank", see here). __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

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