The installation of the Apexi has, in the end, necessitated the removal of the ABV blanking plate mod. Although it created great chatter when partnered with the standard airbox and K&N panel filter, with the unrestricted Apexi the sound became too distorted and, more importantly for a quiet guy like myself, just too damn loud! At the moment the standard ABV is back on (and typically makes a really nice sound now!) but as this won’t cope with anything above the standard 0.9bar I’ll need to find a new long-term solution…