The stock manifold seems to only be good to about 25 or so psi and will let go at about that point. I actually purchased the conversion kit that was used in Hojin's build. I sold it to him after I had conversations with Sebastian, Tony and Sharif about the conversation kit and the benefits or not to my build. The long story short is the kit makes great low end and on a stock block at the most you want to make is about 560 ft lbs of torque and you can achieve that with a stock manifold. I think there maybe some benefits to the guys and gals with a Stillen supercharger that doesn't come close to maxing out the engine internals but for those achieving numbers close to the max without it, I don't see much benefit. Just my two cents!
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