Just an update
This evening I swapped the paper air filter for the K&N one. Very easy swap, just had to take three bolts out to lift the filter box clear of the water expansion tank/reservoir thingy whatever it's called - black thing where water goes ( you can tell I dont know much about cars)
Popped the new filter in and took it for a quick drive round a few country lanes and the engine and exhaust is definitely louder, deeper sounding and more rumble
I would not have believed a filter could make that much difference
