r55 , i have got a K n N typhoon, Japspeed manifold and de-cat these are two separate pieces and power flow exhaust system.
the car was producing 208bhp with these mods and with the uni-chip it totally transformed the car, powers all the way through the rev range and the torque increase is also felt lower down the revs.
Cool Iv been quoted £400 to get it fitted and mapped live on the rr Iv got a aem cai, supersprint bpipe and spoon n1 so wouldnt get as much gains as you.
Just dont know if the gains would be worth the money was told to expect between 210 - 220bhp but that wont be at the wheel would it?