Will Evo mani fit ?

[BOBS90TURBO]

I need to know if the evo exhaust manifold will fit my 90" gst and if it does should I expect any install problems, also how much hp gain?
Would I be better off with a 2g mani?

 

[91TSI505]

Yes it will bolt right up.
2G mani < Evo mani
???? HP gain,but i would say you will notice it spool a little faster
I would get it ported before you put it on