The advantage which is little goes to the straight discharge. The reason supposedly is that the bend immediatley out of the SC is a form restriction and slows the flow. The disadvatange is very small, however. Don't base your decision on buying the straight discharge due to this. Unless you are running and all out race car where every HP counts buy the one you prefer for various other reasons. Cost, installation, room placement, etc..

Also you must have a custom made dis tube for the straight setups. They don't come with one. And it is expensive to have one made. Something else to keep in mind.