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Old 12-15-2025, 11:26 AM   #15
JSH


 
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Drives: '20 ZLE
Join Date: Jun 2020
Location: Mile High
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Quote:
Originally Posted by Joshinator99 View Post
my car is virtually track only
I've concluded this year that I wasn't getting enough seat time to justify my track-only setup, so I'm putting the suitcase back on it, along with some cats and a larger upper pulley.
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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+:
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Old 12-15-2025, 11:40 AM   #16
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Location: Mile High
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Quote:
Originally Posted by SOCAL.M6.ZLE View Post
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...
Mine has Kooks LT and their green Gen 1 cats now. Are these a direct replacement in terms of their size for my Gen 1s?
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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+:
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Old 12-15-2025, 11:44 AM   #17
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Location: Mile High
Posts: 4,148
Could anyone explain the Kooks' price to me?
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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+:
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Old 12-15-2025, 11:47 AM   #18
SWFLZL1
 
Drives: 2022 ZL1
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I think the cost is for two, meaning a set. I see you have qty 2 in the cart. I have them, and I remember them being roughy $1800 lat year. They are the 4.5” HO cats, so I believe it doesn’t get much better than that.

I guess you could buy just the cats, and have someone weld them into your existing exhaust, but do not know how much will be saved, after paying someone to fabricate.
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Old 12-15-2025, 11:49 AM   #19
RobZL1
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Drives: 2017 ZL1
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Bingo. Just need Qty.1. $1,500 for the cats plus whatever the weld-up costs would be. Might be cheaper just to get it fabbed up. (Should be cheaper than $750 I would hope.)
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2017 ZL1 M6 Black | Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // BMR MM // BC Forged KL13

Mods being installed-
oil pump, cam, ported heads, dual in-tank, Goliath and XDI, corn, etc., etc.
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Old 12-15-2025, 11:55 AM   #20
SOCAL.M6.ZLE
Having FUN in the SUN...

 
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Drives: 2022 M6 ZL1 1LE
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Hey guys... I see there is a nice looking website selling them for $1,490 per set... Just called him and he has 1 sets left on the shelf... These are the 4.5" UHO versions. Same ones I run on my car...

Just saying
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