Hmmmm so I'm still thinking, what should I do? Spacer or kinetix v+ and why? And if spacer, which has been proven to be the best size? Because I was told by someone that he thought that the 1/2 was the best in his opinion because of the top end gains, but mine is auto so I'm not sure?

 

^I don't know how the V+ performs, since its not made of metal it should save on weight compared to the stock plenum and may help reduce the intake temperature. The difference between the 5/16" and 1/2" spacer really isn't much. Since you redline around 6,700 RPM, the 5/16 would probably be the better choice.

 

The Rev-up engines redline at 7k rpms, that's how you can tell.