What is the point of using say a TO4S cover (4" inlet, 2.5" outlet) over say a TO4E cover (3" inlet, 2" outlet) does having a bigger inlet/ outlet help any, such as maybe keeping temps down or helping to just flow more air? is there any real benefit to it or would it only be on a fairly large turbo? Just wondering if I should consider the TO4S cover for the PTE SC-60 im getting or if the TO4E will be just fine.