Quote:
Originally Posted by garagelogic
For the record, the 1986 Mustang GT introduced "tuned" tubular exhaust manifolds to the original 5.0L engines. The "headers" on the modern factory 5.0 are certainly better than the cast iron exhuast manifolds featured on previous modular motors, but suggesting you won't see significant gains with longtubes on the new motor is disingenuous. 
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You will see gains without doubt...what's he's pointing to is the fact that longtubes on LS series engines have always been worth 30+ RWHP.
I doubt you're going to see that large of a gain on the 5.0 when the factory suppiled manifold is light years ahead of the OEM LS3 manifold.
Ya see what we're sayin