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I would say the top, as the input and output run parallel to one another, unlike the bottom their offset at 45 degrees angles.
I wouldn't envy you trying to make these work.
They're both kind of crap, but as mentioned 1st due to build, not design. formed x-pipes don't flow as well an x-pipe like below. the second pictured is just weird.
burns will be pricey... go with a magnaflow as below
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
