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your 640 sounds better than cayman gts !!
HI everyone i have the recipe to make your 640 sounds better than cayman gts latterly ..
it will blows in up shifts and through grenades in down shift 
first : down pipe (burger tuning) or what ever u like (same pics)
second : secondary muffler delete (x-pipe) did by exhaust specialist (welding job)
third: M performance exhaust muffler (cat-back) (buy from dealer)
and last : burger tuning air filter for turbo whistles
car much much faster to
its cheap way and sounds better than 3$++ exhaust systems and preform like monster
some pics :
x-pipe
down pipe with filter :
filter installed :
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