janspeed decat - (1bhp if your lucky, janspeed de-cat is the best de-cat IMO, as it doubles as a silancer 
1.0l middle section ( no silencer) - (no gain what so ever)
almera airbox and ducting to grill - (1bhp? will gian better response and tourqe)
back box - (better response, could give you 0.5bhp gian? lol