Speed Engineering 1-7/8" Longtube Headers — 2004–2006 Pontiac GTO LS1/LS2 5.7L/6.0L | 25-1050 2001-ford-excursion-esi9404716 connecting rod bearings for the

connecting rod bearings for the Duratec are sold separately by ACL

smooth operation

and ZR1 models

) from stock

The intake tubing is constructed from mandrel-bent aluminum featuring a durable red powder coated finish

Speed Engineering 1-7/8" Longtube Headers — 2004–2006 Pontiac GTO LS1/LS2 5.7L/6.0L | 25-1050 2001-ford-excursion-esi9404716 connecting rod bearings for theThe factory exhaust manifolds on your GTO are one of the first restrictions holding back your LS1 or LS2. Speed Engineering's 1 7 8" longtube headers are a direct fit, dyno proven upgrade that frees up exhaust flow, improves throttle response, and delivers over 25 rear wheel horsepower over stock. Built from 304 natural stainless steel with mandrel bent primary tubes, CNC machined port matched flanges, and full TIG welded construction. Important: