Why would Buick put a single exhaust on this power-house?
Buicks tend to be low rpm torque monsters. you're unlikely to turn 6000rpm without significant intake mods. without the large volume of air that high rpm produces, you can actually hurt your performance by going too big on the exhaust because it will kill velocity if the pipe is too big.
also, a single large pipe will tend to flow better than two smaller pipes of the same cross section ... due to having more surface area ( drag ) per volume than the single.
this is not to say that a custom, mandrel bend dual exhaust would not be an improvement. the OEM exhaust is designed for cheap, quick mass production. maximizing performance is NOT what they were primarily concerned with.
will i need to replace the manifolds to run dual exhaust
more performance is found in headers than in dual exh anyways ( assuming the exh is not already too restrictive ), why would you not be getting headers?
regardless, the stock manifolds should be fine for duals.
http://www.taperformance.com/products.asp?cat=386
you notice that even TA is using 2 1/2" pipe for their secondary for some of their 425s? i certainly wouldn't go over 2 1/2" on a dual system. and even then i'd only run the 2 1/2" back to an X crossover and then neck down to 2" beyond that.
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