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Granatelli Motor Sports Electronic Exhaust Cutout System; 3-Inch (Universal; Some Adaptation May Be Required)

Item S102273
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      Video Review & Installation

      So, if you own a '99 to '18 Silverado or Sierra and you're watching this video, then chances are you've been looking for the loudest possible exhaust you can throw on your truck but you still want the ability to keep things relatively quiet and street-legal when the noise gets to be a bit much. Now, I can confirm that you've found the solution with this very unique three-inch electronic exhaust cutout system from GMS. I'll be honest guys, just recently I had some fun with one of our Silverados in between an exhaust install video. I decided to do what most people do and run it with no pipes or muffler for a few minutes just for the hell of it. And guys, honestly, it sounded surprisingly good. The idle was actually really deep in a good way and when I got on the pedal, it still sounded pretty throaty, it wasn't excessively raspy or gurgly, and it honestly wasn't so loud that it was buzzing my ears inside the cab. So, it's a great setup to be sure, but obviously, running your truck like this would normally mean you're ditching your muffler and your resonators for good, giving your exhaust a strong five out of five on our loudness meter. But let's face it, for lack of better phrasing, a setup like that is just not street-legal pretty much anywhere you live and it might honestly be a bit too much on those early morning cold starts or the daily commute and that's where GMS's kit comes in. This is a very easy to install cutout kit, honestly. It takes about two to three hours to get it bolted in. And I'm gonna give it a soft two out of three wrenches on my difficulty meter and that's only because you have to make some cuts to the factory tubing using a Sawzall.So, this kit essentially clamps in just behind the factory Y-pipe and just in front of the muffler. Now, once it's wired up all you need to do is press the toggle switch inside the cab and the butterfly valve on the bypass tube opens up and it's gonna dump all of your exhaust in front of the muffler through this tip right here. That's where you're gonna get all that nasty good sound from. However, if you've had your fun, you're getting kind of tired of it or if you do get pulled over after that spirited takeoff, then all you need to do is press the toggle switch again and bam, you're back to a factory exhaust that's quiet and unsuspecting. Obviously, Johnny Law might not be too amused. But in all seriousness, guys, this is nothing new to the exhaust world, but what's cool about this kit is the fact that it's specifically designed for the Silverado and Sierra. And all the tubing, flanges, and the motoring wiring are pretty much done up for you. Now, cutout kits are normally installed as one-off custom jobs or you can find them as part of a complete cat-back, but obviously, that cost a lot of time and a lot of money. Now GMS made this kit to fit at home with your factory exhaust and with only basic hand tools required for the install. Obviously, that makes this kit a heck of a lot more affordable and I love the price because of it. At below $200, this is technically the least expensive exhaust system available for the '99 to '18 Silverado or Sierra and it's also one of the loudest. So, goes without saying, that's a really cool two for one deal in my book. And for the price, guys, honestly, everything in this kit is very well built. Nothing in here is considered a gimmick. Everything is made from 6061 billet aluminum and stainless steel for the tubing itself and the electric motor is definitely rated to operate in high temp conditions. So, the toggle switch is pre-wired, makes that part pretty simple. All you gotta do is find power to it from a 12-volt source and you got to find a nice spot to mount it inside the cab, but GMS details the wiring and the power source in more detail in the instructions so you will have some guidance when it comes to wiring things up in the cab. Now, one last thing to point out is this kit will technically work with any three-inch aftermarket cat-back as long as you size up the new cat-back's mid pipe to fit with the GMS cutout. So, you're not just stuck with that factory exhaust if you do wanna upgrade later on down the road and you want something that's gonna be louder than stock when the butterfly valve is closed. And what's even cooler is GMS even states that you can technically buy two of these kits, can actually wire them up to work in sequence if you have a true dual custom exhaust system installed already. So, all in all, the GMS electronic exhaust cutout system is a very cool and very easy way to get your '99 to '18 Silverado or Sierra sound going from mild to wild while spending the least amount of cash in the wallet and while spending the least amount of time under the truck turning wrenches compared to other exhaust systems. I'm Travis. Thanks for watching. Be sure to check this thing out more on the site. Keep it right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 3" Electronic Exhaust Cutout
      • CNC Machined 6061 Aircraft Quality Aluminum
      • Adds Aggressive Note
      • One-Touch Operation
      • High Temperature Drive Gears
      • Polished Stainless Steel Turndowns
      • Frees Up 10-15 HP
      • Weld-On Installation
      • Available Individually or as a Pair
      • Fits 1999-2022 Silverado 1500's


      One-Touch Loudness. The GMS 3" Electronic Exhaust Cutout System allows you to open or close your cutouts with the press of a button, giving you a loud and raw exhaust note. Allowing the exhaust gases to flow more freely, Granatelli Motor Sports Electronic Exhaust Cutouts open up your Silverado's exhaust system, yet allow you to keep things quiet and turned down when you need them to be. Freeing up 10-15 HP, the GMS Electronic 3" Exhaust Cutouts will totally transform the sound and performance of your truck, giving you a whole new experience.

      Lightweight Aluminum Construction. The GMS 3" Electronic Exhaust Kit is crafted from CNC machined 6061 Aluminum, which is incredibly lightweight and strong. High temperature carbon steel drive gears ensure that your cutouts will continue working despite how hot things get from the exhaust. Thanks to "Smart Chip" controlled motors, all you have to do is hit the button once to open up the cutouts on your Silverado.

      Bolt-On Installation. The GMS Electronic Exhaust Cutout System can be installed in a few hours and with a decent set of hand tools. The cutout comes with all of the necessary hardware, wiring, gaskets, and parts you need to successfully complete this installation.

      Application. The GMS 3" Electronic Exhaust Cutout Kit works on 1999-2022 Chevrolet Silverado 1500's.

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      Granatelli Motor Sports 307530


      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Cutout
      • (2) Gaskets
      • (1) V-Band Clamp
      • (1) Polished Stainless Steel Turndown
      • (2) Wiring Harnesses
      • (6) Bolts and washers
      • (1) Flange

      Customer Reviews (13)

        Questions & Answers

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