Stock manifolds.....
 

I got an '01 Bullitt I just bought a month ago. I want to upgrade the exhaust but I've never tackled one of these modular motors before. I want to get rid of the stock mid pipe and go with a Jegs O/R version as I already have a set of brand new summitt high flow cats and can add those on. My qustion is (as strange as it sounds) should I ditch the stock manifolds? A friend told me they are not worth the hassle and going from the manifolds back, headers would only get me 5 more ponies, is this true or is this BS? The last mustand I did was many years ago and it was a 90 LX. So any help for this is a plus......THANKS!:)