[Spartarus]

Short answer: If the tuner was any good, no, you won't need it re-tuned if you stay with equal-length headers.

Oh, another satisfied Borla customer. Dammit. Borla, like many aftermarket companies, have sold out completely. They leverage whatever is left of their name and reputation to sell eBay-quality parts with a warranty claim that borders on fraudulent. I wouldn't install Borla parts if they were free.

I've heard the same bullsh*t Borla warranty story a million times in the last few years.