Intake manifold spacer: legit performance accessory?

[9zero1790]

im not saying the spacers do not work as claimed, but if they do make a positive difference they likely have a negative side also. maybe more low end but less top etc. I typically lean toward the attitude that manufacturers do not leave easily made low cost power or efficiency laying on the table without reason. so if something as simple as a spacer could bump up mpg or hp you can bet ford would have put one on at some point. vs. something like a tune, that is proven to have good results and in some cases supported by ford, but they are not cheap.

Sponsored

 

[JohnnyO]

I rather doubt they make any difference. 1, it's a DI engine so the runners are only carrying air anyway and 2, only so much air is going to get thru the turbo and past the intake valves before they close.