4.0" Electric Exhaust Cutout — Switch from Quiet to Loud On Demand A 4.0" exhaust cutout is a valve built into your 4 inch exhaust system that opens to bypass the muffler for an instant, open-exhaust rumble — and closes again for quiet, street-friendly driving. The kits in this collection are electric exhaust cutouts with a remote or in-cab switch, so you control the sound from the driver's seat. Whether you want a deep, aggressive tone at the track or a calm cruise on the highway, one button does it. What's in This Collection 4" Remote Y-Pipe Single Electric Exhaust Cutout Kit — wireless remote control, single-pipe Y design for clean routing 4" Stainless Steel Headers Manual Y-Pipe Electric Exhaust Cutout Kit — header-grade stainless construction with electric actuation 4.0" Stainless Steel Exhaust Cutout Valve — the core electric cutout valve, built from T304 stainless for corrosion resistance Electric vs Manual Cutouts Electric cutouts open and close with the push of a button — no crawling under the truck. Manual cutouts require reaching the valve by hand every time you want to change the sound. For a daily-driven truck that sees both street and strip, the electric kit in this collection is the smarter, more convenient choice. Why Run a 4 Inch Exhaust Cutout? On-demand sound — open it for a throaty, wide-open exhaust note; close it for a quiet neighborhood cruise Lower backpressure when open — frees up exhaust flow for a sharper, more responsive tone under load Bolt-on convenience — mates to standard 4 inch exhaust piping with clamps included, no welding required Durable build — T304 stainless steel valves and Y-pipes stand up to heat, moisture and road salt Fitment & Installation Each 4.0" cutout is sized to mate with 4 inch exhaust piping ; confirm your pipe diameter and available clearance before ordering. SPELAB kits ship with a Y-pipe so they work on both single and dual-exhaust layouts. The pipe side is a bolt-on clamp install; the electric kit adds simple 12V wiring to a power source and the supplied switch — a straightforward afternoon project for most DIYers. Why Choose SPELAB Exhaust Cutouts Stainless T304 construction for long-term rust and heat resistance Remote & in-cab control options so you never leave the driver's seat to change the sound Direct manufacturer pricing — no middleman markup Broad truck coverage across Ford, GM, Dodge/RAM and other 4 inch exhaust platforms Exhaust cutouts are intended for off-road and competition use only. Opening the cutout on a vehicle operated on public roads may violate local noise and emissions regulations. Know and follow your local laws before use.
Source: https://www.spelabautoparts.com/collections/4-0-exhaust-cutout