Building a fully custom LS swap exhaust and want the most complete stainless weld-in kit available? Speed Engineering's 3" Deluxe Edition exhaust builder kit steps it up over the standard and Fabricator Edition kits — adding both a 3" X-pipe and a 2.5" H-pipe to the weld-in mandrel bent 3" stainless tubing assortment, along with stainless band clamps. The most comprehensive builder kit in the Speed Engineering lineup for custom exhaust fabrication on LS swap builds.
Note: This is a universal weld-in build-your-own kit and is not designed for use with any specific Speed Engineering header or pipe product. Welding required.
⚠️ Important: The X-pipe section will not be a direct match-up with the included tubing and will require additional fabrication for proper installation.
Features:
- 3" Mandrel Bent Tubing — Consistent diameter throughout for maximum exhaust flow
- Weld-In Construction — Designed for permanent welded installation
- 3" X-Pipe Included — For crossover between exhaust banks on true dual builds
- 2.5" H-Pipe Included — Alternative crossover option for H-pipe style exhaust layouts
- Stainless Steel Band Clamps Included
- 304 Natural Stainless Steel Construction — Corrosion resistant and built to last
- Universal Fit — For custom LS swap exhaust fabrication
Frequently Asked Questions:
Q: What is the difference between this kit, the standard 3" builder kit (25-1033), and the Fabricator Edition (25-1151)? The standard kit (25-1033) uses slip-fit construction with band clamps and includes an X-pipe. The Fabricator Edition (25-1151) uses weld-in construction with flared ends and no clamps. The Deluxe Edition (25-1112) uses weld-in construction and includes both a 3" X-pipe and a 2.5" H-pipe along with stainless band clamps — the most comprehensive option for builders who want both crossover pipe styles.
Q: Will the X-pipe connect directly to the included tubing? No. The X-pipe section will not be a direct match-up with the included tubing and will require additional fabrication for proper installation.
Q: Does this kit require welding? Yes. This is a weld-in kit and requires welding for installation.
Q: What size tubing is included? All primary tubing is 3" diameter, mandrel bent for consistent flow throughout. The H-pipe is 2.5".
Q: Is this kit designed for a specific vehicle or header? No. This is a universal build-your-own kit and is not designed for use with any specific Speed Engineering header or pipe product. It is intended for custom exhaust fabrication on LS swap builds.
Q: What material is this kit made from? 304 natural stainless steel with mandrel-bent tubing and TIG-welded construction. Stainless band clamps are included