Duel Exhaust
Grandson wants to install duel exhaust on his 08 GMC Sierra 5.3L engine. Any drawbacks to this or is there an upside. I've heard both. With the valve overlap and less back pressure you lose low end to...
Forum Discussion
All it will do is increase the noise and empty the pocket book. Most will see a decrease in performance as well. Duals are only worth while if doing the entire system including headers. They are prone to drone as well.
