APPLICATIONS: 1997-2006 Grand Prix with 3800 Series II or Series III engine 2000-2006 Impala with 3800 Series II engine 2000-2006 Monte Carlo with 3800 Series II engine 1997-2004 Regal with 3800 Series II engine 1995-2006 other applications with 3800 Series II or Series III engine* SLP™ makes their 3800 Series II and Series III headers in the U.S.A., constructed of 409 Stainless Steel with .055" wall thickness, feature OEM head flanges, CNC mandrel bent, 1-5/8" one piece, full-length primaries with NO weld joints, 2-1/4" crossover pipe with torca clamp assemblies on each end (which should eliminate leaking donut gaskets), 3 into 1 design, built-in 3" downpipe/flex joint and a 3" collector. These headers have the EGR provision and are Jet-Hot Sterling dual aluminum-ceramic coated (inside and out). Look for realistic power gains of up to 25 horsepower, depending on your application! They feature excellent front oxygen sensor placement to prevent WOT body contact issues. When you purchase these headers, nothing will need to be beat on, ground down, relocated, inverted, cut off or welded. Click HERE for full-size pictures of the SLP™ Ceramic Coated Headers and accessories! SIK-071 - SLP™ Header Installation Kit - Highly Recommended! INT-3RP - INTENSE™ Race Pipe SHC-073 - SLP™ High Flow Catalyst & Rear O2 Simulator NOTES: - SLP™ 3800 Series II headers are not C.A.R.B. certified, and are intended for off-road use only. * These headers will fit other applications with minor modifications. Other applications that are known to fit are: 2000-2003 Bonneville with 3800 Series II engine, 1998-1999 Intrigue with 3800 Series II engine, 1996-2003 LeSabre with 3800 Series II engine, 1998-2000 Lumina with 3800 Series II engine, 1995-1999 Oldsmobile 88 with 3800 Series II engine, 1996-1996 Oldsmobile 98 with 3800 Series II engine, and 1995-2003 Park Avenue with 3800 Series II engine, although a custom downpipe would be required, as the headers are made for a direct fit on a late model W-body, not an H-body or "pre-gen" W-body.  If you are ordering for one of these other vehicles, please let us know when you order so we can plan accordingly,

Due to the cost/limited mark-up in these headers, they are considered a custom order, and are therefor not refundable once ordered.