1.) this rubber knob (lol) underneath should pull off leaving a small metal peg. The cross on the bottom of the filter box then slots onto this if you loosen the plenum tube arm. Tighten the plenum tube arm and then tighten part 2 up further to secure. This gave me a very tight fit and no movement.
Looks like I missed that bit, thanks for that, bit more tinkering tonight, me thinks!
2.) Did you break these clips? If so, the trick is to use pliers to pick off the bottom bits, then fiddle with it for a while, twist 90* and then pull up hard... seemed to work ok, but was hard work.
yes, guilty! Shame they don't mention that in the instructions!
I get a rasp till 3500 ish, then it really roars. Absolutely love it, however I usually fill up a full tank once a week on a Saturday....I had to fill up again today before leaving work for home, which says something about the noise..!