After talking to Joz about it, and seeing the little pipe he had made up I looked to see if there were any on ebay... and it seems there are, but they're silicon and not aluminium. Righty... onto the plan, just checking that it will be a good setup and not some dodgy bodge job. Corolla Inlet Manifold Silicone 55mm - 70mm reducer (can't find one this size, but close enough) Silicone T-Piece which has a hole for the air sensor. BMC CDA filter Going to have the reducer on the throttle body, t-piece next, with the air sensor in the hole, bit of flexi air feed pipe off the t-piece to the CDA, then the cold air feed going down into the front bumper. Thinking of moving the rad over slightly as it seems there's just two holes that need to be made and the rad moved over a bit but I'm guessing there's more work involved? sounds good? bollocks, just realised I've posted this in the wrong section...