well first thing is to fit a different set of wheels and tyres if possible, to make sure something isnt wrong with the car. Thats if you can abviously.
what tyres are on the rims?
if you got the bolts with the bumper then they are normally long enough to bolt both on, there might need to be a bit of fettling to fit the front plate of the guard on tho
no, i removed all my interior trim apart from the dash, door cards, headliner and the 2 front seats, its not that noisy and you better off without it all anyway if it goes near mud. Also all the people i go offroading with bar 1 has done the same
that pic looks like the kit i got for my V8, the easiest thing to do is buy a BMC or CDA enclosed air filter off ebay and a bit of flexi pipe, something like 80mm diameter and then fix it all together
wobble the steering wheel and get someone to look at the play in the steering arms, to rule out steering box issues or track rod ends
does your vehicle have a lift on?
could be the hamsters are on strike
or if you want a proper anwser it would be usefull to know which engine? or even try the specific section for your type of engine
QT ones that bolt on like a rock slider instead of the round style ones, thats if you dont mind paying the extortionate price for them
the round ones are fine aslong as you clean inside them after offroading
it will be the alpine windows, although it 'looks' like its coming from the square section i bet you any money it dripping in from the window and pooling ontop of it and then dripping off further down the runner
i would just use small self tapping screws about 4-6 inches apart, that way it can be removed every so often and cleaned behind to stop it rusting.
the other method it to instead use pop rivets and to put a thick line of sealant around the edge to stop moisture from getting in if the plate is...
how about getting a 130, removing the roof (replace with rollover bars) and then bolting 10 bucket seats in the back with harnesses. Kids would love that, although they might get a bit wet