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