Pictures are above first pic is N20 2nd N55. Had the same issue with mine mechanic sounds reasonable in his request though! mine and his argument may be in the current IAT temps. What are they? Based on the tuner in Greece that i mentioned on the PM said it was a good change for the N13. it may be a good idea prior remaping to log the stock temps and after the change to log those again and compare and contrast.
stage 2 should be around 240hp and 340-350nm torque
I got the FTP combo deal from Peter @
www.Pureturbos.eu from Belgium i know he has stock on the N13 cause i bought recently from him hence why i know. +10 on his customer service including the after sale service and fast delivery. he was out of stock and under 6 days he had managed to send it to me. He can be found in here or copy paste the address above.
Gains include lag reduction, increased throttle response. time required for the N20 was a full hour. price for the items varies due to the postal method and distance.