exhaust diameter?

what diameter exhaust would be reccomended for a 1.5L with intake and headers? will be doing the mpfi swap and possibly a head swap eventually but thats about it for motor modifications. so perhaps take that into account when reccomending diameter?

also which companies make good mufflers? ive been looking at the skunk2 cans but didnt know if ther are better stuff out ther or if these effect perfomance. are ther any afternarket mufflers that are the same style as stock with the can seperate front the tail pipe?
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