Yeah that S2s are a huge advantage over the HKS cams. HKS cams are just old out dated technology. The Magnus V5 and JM Fab drag manifolds are both excellent manifolds. On one of our Evos we saw a 30hp increase from switching from a Sheetmetal JM Fab Race Manifold to the Magnus V5. There are also gains there as well between the JM Fab Drag Sheet metal and billet versions as well. On my tuners car he struggled getting is DSM into the 7s while running the sheet metal version and then he was given the Prototype Billet version and it finally got the car into the 7s.

 

i have a 4" speed density intake

 

yea i purchased these cams around 2012 so... but i wouldn't mind the 30hp gain from s2's. I dynoded 460awhp (mustang dyno) and my next upgrade will be the magnus intake manifold and we will see how much the hp gain is on the next tune because im so curious lol