Speed Engineering 2004-2006 Pontiac GTO 1-7/8" Longtube Headers
Speed Engineering 25-1050 longtube headers fit the 2004-2006 Pontiac GTO with 5.7L LS1 or 6.0L LS2 engines. Built from natural-finish 304 stainless steel with mandrel-bent tubing, TIG welds, CNC-machined flanges, 1-7/8-inch port-matched primaries and 3-inch collectors.
Vehicle Fitment
- 2004 Pontiac GTO — 5.7L LS1 V8
- 2005-2006 Pontiac GTO — 6.0L LS2 V8
Installation: Speed Engineering requires its GTO X-pipe kit for installation. Select the optional 3-inch X-pipe (25-1051) above if you do not already have it. X-pipe installation requires cutting the factory cat-back.
Build Your Header Package
- Headers only, or add the matching 25-1051 GTO X-pipe.
- Optional SMG LS MLS header gaskets (SMG-25-1001).
- Optional SMG 9070C 8mm ceramic spark plug wires with heat-resistant ceramic boots.
- Select both SMG MLS gaskets and ceramic plug wires for the full upgrade package.
Accessory selections are included in the displayed price. The no-upgrade selection adds no SMG gaskets or ceramic wires.
Race use only. Intended solely for competition vehicles; not for public-road use.
Processing & Shipping Overview
Processing occurs before shipping.
Most in-stock items typically process within 2–3 business days before shipment or pickup. Expedited shipping options affect transit time after an order ships and do not speed up processing.
Made-to-order, special-order, vendor drop-ship, and freight items require additional processing time before shipping. Any extended lead times will be noted on the product page when applicable.
For the most up-to-date order status or lead time questions, please contact sales@smgspeed.com or use live chat during business hours.