The Borla S-Type cat-back exhaust system (PN 140165) is a direct bolt-on dual system for the 2005-2006 Pontiac GTO 6.0L V8. It includes a proprietary Borla X-Pipe that merges the exhaust to blend the powerful V8 pulses, aiding both performance and sound. The full mandrel-bent austenitic T-304 stainless steel cat-back is over 25 pounds lighter than stock while flowing over 200 cfm more air, and it exits through large 5in bright chrome on T-304 stainless steel rolled, round, angle-cut tips in a split rear layout. Borla uses aerospace-grade T-304 austenitic stainless steel, superior to 409 or aluminized steel, with patented straight-through multi-core technology that delivers the S-Type Classic Borla Sound of Power. This system mounts behind the factory catalytic converters and is 50-state emissions legal. It is handmade in the USA and backed by the Borla Million-Mile Warranty.
Specifications:
- System type: Cat-Back exhaust system, dual, split rear exit
- Sound level: S-Type (Classic)
- Includes proprietary Borla X-Pipe
- Material: T-304 austenitic stainless steel
- Construction: mandrel-bent tubing, CNC manufactured
- Tips: 5in bright chrome on T-304 stainless steel, round rolled angle-cut
- Weight: over 25 lbs lighter than stock
- Airflow: over 200 cfm more than stock
- Emissions: 50-state emissions legal
- Made in the USA
- Part number: 140165
Vehicle Applications:
- 2005 Pontiac GTO
- 2006 Pontiac GTO
FAQ
Does the Borla 140165 cat-back fit my Pontiac GTO?
Yes. It is engineered for the 2005 and 2006 Pontiac GTO with the 6.0L V8.
Is this Borla cat-back street legal?
Yes. It mounts behind the factory catalytic converters and is 50-state emissions legal, so it is street legal in all 50 states.
What does this system sound like?
It uses Borla S-Type Classic tuning for an aggressive yet refined Sound of Power, and the proprietary X-Pipe blends the V8 pulses for a smoother note.
What are the tips and how is it backed?
The system exits through 5in bright chrome on T-304 stainless steel round rolled angle-cut tips. It is handmade in the USA and covered by the Borla Million-Mile Warranty.

