Soul or Fabspeed Cats
Thread Starter
Instructor
Joined: May 2013
Posts: 190
Likes: 26
From: Oshkosh WI
Soul or Fabspeed Cats
Anyone just put their cats on? They tell me just doing cats provides the best additional exhaust noise and turbocharger noise. Would love to hear from someone on here that did that mod and kept factory exhaust.
Supporting Vendor
Joined: May 2018
Posts: 5,250
Likes: 416
From: Philadelphia
I posted in the other ZR1 exhaust thread the car that we just did with the Fabspeed full system but here's one that I took with just SOUL Catted Downpipes and OEM exhaust.
Adding the catback gives you maybe another 10% or so, majority of the volume gain is definitely in the Downpipes.
Give me a shout if you'd like to discuss options or for forum pricing
- Alec
267.788.4897
Adding the catback gives you maybe another 10% or so, majority of the volume gain is definitely in the Downpipes.
Give me a shout if you'd like to discuss options or for forum pricing
- Alec
267.788.4897
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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!
Supporting Vendor
Joined: Jan 2016
Posts: 82,544
Likes: 718
From: Orange County, CA
Yes doing cats itself is popular with the C8 platform, including the z06 and zr1.
Cats are great bang for buck for performance.
We do a lot of Soul with great feedback but lead times are long, Fabspeed is one week or less.
You'll be happy with either, we're dealers for both as well to help you.
-Josh
Cats are great bang for buck for performance.
We do a lot of Soul with great feedback but lead times are long, Fabspeed is one week or less.
You'll be happy with either, we're dealers for both as well to help you.
-Josh
The Consigliere
Joined: May 2006
Posts: 23,003
Likes: 6,045
From: 2023 Z06 & 2010 ZR1
How well do these cats live under heavy track use, particularly for the ZR1? Many aftermarket high flow cats die in high hp applications when worked hard.
Anybody got any durability/endurance data on Soul or Fabspeed cats in high hp boosted applications?
Anybody got any durability/endurance data on Soul or Fabspeed cats in high hp boosted applications?
Last edited by OnPoint; Jun 6, 2026 at 03:16 PM.
Burning Brakes
Joined: Jan 2025
Posts: 754
Likes: 475
Yes doing cats itself is popular with the C8 platform, including the z06 and zr1.
Cats are great bang for buck for performance.
We do a lot of Soul with great feedback but lead times are long, Fabspeed is one week or less.
You'll be happy with either, we're dealers for both as well to help you.
-Josh
Cats are great bang for buck for performance.
We do a lot of Soul with great feedback but lead times are long, Fabspeed is one week or less.
You'll be happy with either, we're dealers for both as well to help you.
-Josh
Supporting Vendor
Joined: May 2018
Posts: 5,250
Likes: 416
From: Philadelphia
Fabspeed uses HJS Cats which are some of the best of the best, rated for 1200hp per bank and wrapped in Inconel heat blankets. Quality stuff..
No CELs from the cars that we've done
Last edited by FORZAMOTORWORKS; Yesterday at 12:16 PM.
Supporting Vendor
Joined: Feb 2020
Posts: 742
Likes: 353
From: Fort Washington, PA
C8 Corvette ZR1 Sport Racing HJS German Catalytic Converters
Crafted from aerospace-grade T304L stainless steel, Fiber Optic Laser and back purged TIG welded for maximum durability, this upgrade delivers a deeper, more aggressive tone while saving significant weight. Saves -20 pounds -9.1KG, while unlocking real horsepower gains. Expect 100% guaranteed quicker turbo spool-up/spin up transient response, a ferocious growl, and dyno-proven performance increases across the RPM range.
Whether you're chasing numbers or just want your ZR1 to sound as wild as it looks, this is the upgrade it’s been begging for!
- Fits all 2025+ C8 ZR1's (does not fit 2026+ ZR1X's)
- High-flow, emissions-compliant and certified maximum possible performance catalysts
- Dyno-tested horsepower and torque gains- NO BULL-****. +91 HP and +141 lb-ft TORQUE 120.5 dB
- Signature Fabspeed sound—bold, refined, and unapologetic
- 100% CAD designed, CNC machined, and manufactured at our Fort Washington facility, therefore it is 100% Made in the USA!
- Bolt-on power. Track-ready tone. No compromises.
- Insulated with 2000 degrees Fahrenheit/ 1094 degrees Celsius ceramic fiber, wrapped in a 625 Inconel Double Wall Heat Blanket
- More power than Cat-bypass pipes ZERO need to go cat-less and be illegal.
- Fabspeed USA - HJS Germanys 25 year USA North American exclusive imported dealer distributor- genuine HJS - Emitec HJS racing catalytic converters.
- We use German-made HJS HD tri-metallic 200-cell EURO 6 homologated catalytic converters for the best performance and reliability
- NO catalyst generated check engine light (CEL) Guaranteed
- No ECU tune required
- Simple bolt-on installation, no cutting or welding required
- Not cross-compatible with ZR1X
- All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty
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Verdad Gallardo
Full size member
Joined: Jul 2008
Posts: 2,180
Likes: 126
From: Your mom's house
Fabspeed will not honor their warranty. I have a set on my Z06 and they get a CEL light. In the beginning when they started offering the high flow cats for Z06, they guaranteed no CEL light right on their website. This is why I purchased them. I've made many calls and multiple emails and just crickets. I've installed a few of the fabspeed cats on Z06s in my area at my shop. All got CEL lights. I will no longer recommend their product all because they will not honor their stated warranty. The nail in the coffin was not returning my calls for a refund. For my ZR1, I'll be looking into Soul.
I will give fabspeed this, the craftmanship and overall quality is top notch. All the way down to the packaging.
I will give fabspeed this, the craftmanship and overall quality is top notch. All the way down to the packaging.
Last edited by 1 BAD ZR1; Today at 01:24 PM.
Safety Car
Joined: Mar 1999
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From: Toronto, Canada