What is the best exhaust for K04 and KO3?

 I am from Bulgaria ...sorry for my bad english. So ..i have A4 AEB fwd now with ko3 and chip ... i want new exhaust ... but soon i want change my turbo with ko4.
One more question ... is it posible for ko3 make ~200 hp with chip and exhaust ... and ~210hp if i put good fmic?

techtonics or any 2.5" exhaust. and yeah those numbers are about right.

I have offer for 60mm pipe ... this is 2.364" .. in Bg we work with mm,and here 60mm is most use pipe size.. but the difference is little. :)

that'll work fine for any k03/k04 setup