quote:
One thing that I forgot to mention in my original post is that she already has a big bore exhaust on her as well so it sounds like that will only help. What prompted my original question was that I had seen a 4-hole phenolic spacer on PI's website that claimed around 40 horses and I didn't know if would apply or not.
Like all ads, you have to take that one with a grain of salt I think. There may be applications where a spacer could give a 40 hp boost. There will be others where it will give zero boost, or other where it could even hurt your power development.
Every dyno test result I've seen implies that the benefit of a spacer depends on the specific configuration of a specific engine and the only real way to tell if it is helping you or not is to dyno test it. There are engine combinations that perceive no benefit from a spacer, and others that do. 40hp sounds a little generous regardless based on what I think I've seen based on dyno tests...