Hello All, I am thinking of fitting a roller barrel upgrade to my car. The car is a 2018 420R SV model. I understand it'll give an extra 10 BHP but can somebody help with the following queries? i) to keep within the terms of the warranty, I assume, I have to buy the upgrade from Caterham, ii) will it improve idle speed and acceleration from stop, iii) being a SV, will it fit within the existing engine bay without altering bonnet and iv) can I fit the upgrade myself (Caterham reprogramming the ECU). Many thanks Martin.