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
I think I've seen a warning from Ford on the 6.7L not to alter the exhaust system since the whole system is tuned to a certain pressure. They warn you to keep those vents near the tail end on the pipe open too.
