3 Products
4.0" Exhaust Cutout
A 4.0" exhaust cutout refers to a component used in automotive exhaust systems. The "4.0" specification refers to the diameter of the exhaust cutout's opening. In this case, it's a 4.0-inch diameter opening. This size measurement is critical because it needs to match the diameter of the exhaust piping to which it will be installed.
In addition to the electric-exhaust-catback-cutout-valve, spelab still sells Exhaust Header, Oil Cooler Kit, Downpipe Exhaust, EGR FCV Full Kit, etc.
Filter products
- ENGINE
-
POWERSTROKE
- DPF Delete Exhaust
- All In One Kit
- EGR Delete Kit
- CCV PCV Reroute Kit
- DPF Delete Dual Exhaust
- Tuner
- Intercooler Pipe Kit
- Up-Pipe
- Intercooler
- CP4 Bypass Kit
- CCV Recirculating Kit
- Muffler
- Downpipe
- Intake Manifold
- Air Intake Kit
- Radiator
- Oil Catch Can
- Differential Cover
- Coolant Tube
- Valve Cover
- Transmission Pan
- Coolant Expansion Tank
- Exhaust Manifold
- Turbo
-
DURAMAX
- Tuner
- EGR Delete Kit
- CCV Reroute/delete kit
- DPF Delete Exhaust
- DPF Delete Dual Exhaust
- All In One Kit
- Muffler
- Up-Pipe
- Downpipe
- Intake Elbow Bridge Kit
- Intercooler
- Intercooler Pipe Kit
- Air Intake Kit
- Radiator
- Differential Cover
- Valve Cover
- Oil Pan
- Cooler Line Kit
- Fuel Sump Return Kit
- Tonneau Cover
- Coolant Tube
-
DODGE RAM
- Tuner
- EGR Delete Kit
- CCV Reroute/delete kit
- EGT Relocation Kit
- DPF Delete Exhaust
- All In One Kit
- Muffler
- Air Intake Kit
- Intercooler
- Intercooler Pipe Kit
- Radiator
- Valve Cover
- Differential Cover
- Intake Manifold
- Coolant Bypass Kit
- Coolant Leak Repair Kit
- Fuel Rail Plug
- Fuel Tank Sump Kit
- Oil Catch Can
- Oil Pan
- Coolant Tube
- ALL-IN-ONE KITS
- CATEGORIES
- ON SALE
Let customers speak for us
from 5335 reviews
Welds look solid and professional quality, I have not installed them yet but I did put them in place under truck to ensure length and thus far everything looks good. I will give an update after install and on the road with them
Product came in earlier than expected and is made out of high quality materials. SPELAB hasn't let me down yet!!
The product installed perfectly high-quality superior part. For my 2022 f350. Coolant reroute kit.
Everything works great all parts fit hangers fit have pictures if needed
This is a really nice set up inexpensive but well-made. Make sure you use 1/4 inch drive and torque wrench, if you get the half socket 10mm and multi size extensions even better it’ll make getting those two back bolts easy
Makes truck breathe better and will definitely blow your y bridge out so do that while you’re in there looks great and fits up pretty good not perfect
Installed this SPELAB EGR Throttle Valve Delete on my 6.7 Cummins and the fitment was perfect. The kit was well made, installation was straightforward, and all the necessary parts were included. Everything lined up as it should and the truck runs great. Highly recommend for anyone looking for a quality replacement component.
I originally had the Banks Monster Ram intake with grid heater delete, and costed $1200. Recently I decided to give Spelab a try for their 3.5” pusher style intake with grid heater delete. Fraction of the price and performs the same. Only regret I have was my purchase of Banks.
Great product
Good product fast sipping was not that bad of a job
Nicely done ✅
Easy installation and everything fit perfectly. The kit is well-made, comes with the necessary components, and worked as expected. Shipping was fast and the quality exceeded my expectations. Highly recommend for anyone looking for a reliable EGR delete kit.
Very impressed with the quality of the cooler. Couldn’t find any instructions for the install. However, I was able to figure it out and plan to post a video for anyone else who may need help with the install.
Installed this on my 2015 6.7 Powerstroke and everything fit perfectly. Quality parts, straightforward install, and noticeable improvement in engine temps and reliability. Would definitely recommend this kit to anyone doing an EGR delete.
Installed on a 2019 Ram cab and chassis with no issues. Fitment was good, quality looks solid, and throttle response feels better. Definitely recommend this intake horn/grid heater upgrade.
4‑inch Exhaust Cutout FAQ
A 4‑inch exhaust cutout is a valve installed in your exhaust system that allows you to switch between a quiet, stock‑style path and a straight‑through, louder path. The 4‑inch diameter matches common aftermarket exhaust piping on diesel trucks.
Installing a cutout lets you control your truck’s sound and exhaust flow on demand. Benefits include:
- Louder exhaust tone for a more aggressive sound when wanted.
- Potentially improved throttle response by reducing backpressure in the straight‑through mode.
- Easy switching between a quiet daily‑drive mode and a performance‑oriented open mode.
- Electric cutouts come with a remote or dash switch, letting you open/close the valve from inside the cab. They’re convenient for frequent changes.
- Manual cutouts require you to reach under the truck and turn a lever. They’re simpler, have fewer electrical components, and are often more affordable.
Most SPELAB 4‑inch cutouts are designed to fit popular diesel platforms:
- Ford Powerstroke (6.7L, 6.4L, 6.0L)
- GM Duramax (L5P, LML, LBZ, LLY, LB7)
- Dodge Ram/Cummins (6.7L, 5.9L)
Always check the product listing for exact year‑range and engine confirmation.
Installation is straightforward for most DIYers:
- The kit includes a Y‑pipe that welds or clamps into your existing exhaust.
- Wiring for electric cutouts typically runs to a 12V source and a switch.
- No tuning or ECU changes are required.
Basic welding skills or exhaust clamps are needed for the pipe connection.
Yes, but consider:
- Noise – open cutouts are significantly louder and may not be street‑legal in some areas.
- Backpressure – running open can reduce low‑end torque on some turbo‑diesel engines.
- Heat – exhaust gases exit closer to the cab, so ensure nearby components are heat‑shielded.
- Electric cutouts – keep the actuator and wiring clean; apply anti‑seize on the valve shaft annually.
- Manual cutouts – lubricate the pivot point periodically to prevent seizing.
- All types – inspect for rust (especially on mild‑steel units) and ensure bolts/clamps stay tight.
No. Since the cutout is downstream of oxygen sensors and diesel particulate filters (DPF), it does not interfere with emissions systems or trigger fault codes. It’s a non‑intrusive modification.
