High flow cat options?
Thread Starter
Burning Brakes
Joined: Oct 2019
Posts: 843
Likes: 526
From: Colorado Springs
High flow cat options?
We pickup our Z06 on Saturday and cats is high on the mod list. Who makes decent cats and/or test pipes? Does anyone sell just the cores so I could dismantle the OEM ones?
Merry Christmas all!
Merry Christmas all!
Heel & Toe
Joined: Aug 2024
Posts: 23
Likes: 22
I recently picked up a set of Milltek high flow cats from one of the vendors on the forum. No check engine light after around 100 miles and two weeks. Got them installed by the dealer and they charged me for 3.5 hours.
I’m quite surprised at how much louder these made the car in track exhaust setting. I’d read reviews and heard others talking about it but hearing it in person is definitely a nice surprise. I back my car into the garage so the exhaust is facing the primary living space, but a cold start is now loud enough I’m having to adjust pictures on the walls inside the house that have gone crooked from the vibration at startup.
I’m quite surprised at how much louder these made the car in track exhaust setting. I’d read reviews and heard others talking about it but hearing it in person is definitely a nice surprise. I back my car into the garage so the exhaust is facing the primary living space, but a cold start is now loud enough I’m having to adjust pictures on the walls inside the house that have gone crooked from the vibration at startup.
Supporting Vendor
Joined: May 2018
Posts: 5,250
Likes: 416
From: Philadelphia
I've done a ton of different High Flow Cats on the Z06 - Milltek, SOUL and Fabspeed.
I think the Milltek are tough to beat for the $$ considering they include heat wrap and a quality cat core. SOUL and Fabspeed are great too however I'd avoid the cheaper options.
Personally wouldn't go with test pipes as you'll deal with potential CELs, raw gas smell, emissions issues etc.
HF Cats are IMO the perfect set up with the OEM exhaust - adds just the right amount of volume.
Feel free to give me a shout to discuss or for forum pricing.
- Alec
267.788.4897
I think the Milltek are tough to beat for the $$ considering they include heat wrap and a quality cat core. SOUL and Fabspeed are great too however I'd avoid the cheaper options.
Personally wouldn't go with test pipes as you'll deal with potential CELs, raw gas smell, emissions issues etc.
HF Cats are IMO the perfect set up with the OEM exhaust - adds just the right amount of volume.
Feel free to give me a shout to discuss or for forum pricing.
- Alec
267.788.4897
__________________
Alec @ Forza Motor Works
(267) 788.4897 Call/Text
info@forzamotorworks.com
www.forzamotorworks.com
Your trusted source for premium parts - offering competitive pricing, exceptional service, and professional installation options.
Corsa | Borla | AWE Tuning | Girodisc | Halltech | American Racing Headers | Milltek | Soler | Weld | Fabspeed | SOUL | Kooks | BC Forged & 100's more!
Alec @ Forza Motor Works
(267) 788.4897 Call/Text
info@forzamotorworks.com
www.forzamotorworks.com
Your trusted source for premium parts - offering competitive pricing, exceptional service, and professional installation options.
Corsa | Borla | AWE Tuning | Girodisc | Halltech | American Racing Headers | Milltek | Soler | Weld | Fabspeed | SOUL | Kooks | BC Forged & 100's more!
Safety Car
Joined: Jun 2006
Posts: 4,007
Likes: 1,488
From: Ashland, OH
I recently picked up a set of Milltek high flow cats from one of the vendors on the forum. No check engine light after around 100 miles and two weeks. Got them installed by the dealer and they charged me for 3.5 hours.
I’m quite surprised at how much louder these made the car in track exhaust setting. I’d read reviews and heard others talking about it but hearing it in person is definitely a nice surprise. I back my car into the garage so the exhaust is facing the primary living space, but a cold start is now loud enough I’m having to adjust pictures on the walls inside the house that have gone crooked from the vibration at startup.
I’m quite surprised at how much louder these made the car in track exhaust setting. I’d read reviews and heard others talking about it but hearing it in person is definitely a nice surprise. I back my car into the garage so the exhaust is facing the primary living space, but a cold start is now loud enough I’m having to adjust pictures on the walls inside the house that have gone crooked from the vibration at startup.
Thread Starter
Burning Brakes
Joined: Oct 2019
Posts: 843
Likes: 526
From: Colorado Springs
Heel & Toe
Joined: Aug 2024
Posts: 23
Likes: 22
Thread Starter
Burning Brakes
Joined: Oct 2019
Posts: 843
Likes: 526
From: Colorado Springs
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Heel & Toe
Joined: Aug 2024
Posts: 23
Likes: 22
Not a silly question at all, I had to do the same research. Check your state and local laws but in my state and county (MO/STL) I can. This was the deciding factor for me going high flow cats over no cats.
Racer
Joined: Jan 2025
Posts: 391
Likes: 178
From: North Carolina
Awesome, thank you. I will have to do the same here in NC / CLT. Did you compare the amount of emissions gas allowed (whatever the metric is), compared to what the cats allow? Or does Mo only check for CEL and/or by plugging into ecu?
Safety Car
Joined: Jun 2006
Posts: 4,007
Likes: 1,488
From: Ashland, OH
Complete Street Performance has a video on You Tube same day, same dyno power loss changing stock converters.
Instructor
Joined: May 2024
Posts: 132
Likes: 192
From: Orange County, CA
Running 100 cell HJS cats from Kline coupled with their rear section- 300 miles on my second 3LZ with no CEL... I did get random CEL's on my 24 Coupe though via 3000 miles or so.
I dont mind it for this
I dont mind it for this
Racer
Joined: Mar 2013
Posts: 400
Likes: 112
From: MD
Do yourself favor by adding 45 degree angle 02 spacers when u install your cats. Space is really tight and its good idea to prevent future headaches. My miltek flagged cel at 2600 miles. I was a fool to believe this "no CEL promises"
Supporting Vendor
Joined: May 2018
Posts: 5,250
Likes: 416
From: Philadelphia