it depends on how low/high do you want to sit? the brides will give you a pretty low (if i'm not mistaken, about 30mm lower than stock) seating position where as the recaros (stock i'm presuming)...
as long as the engine is registered to the vin, then vicroads couldn't care less. they only worry when all the numbers don't match up so make sure all the numbers are there on the proof of purchase...
its normal mate, nothing to worry about. if your so worried, you should've bought the silent type. you've most likely got the 309-D, should've gotten the 309-DS(ilent)
not entirely true, pre 1996 cars had the option of having an airbag. post 1996 cars, it was compulsory to have air bags. in saying that, any car made in the years 1996 and after are not allowed to...
you'll never be able to replicate the type R's chassis as well. type R's have a stronger chassis, doesn't come with sound deadening and also deleted side mouldings plus everything else that quang has...