yeah same filters, renault just give you the wee one though. There is a slightly bigger one which was standard like the 19's, but smaller than the full fat diesel job, can't use them as they clip the fan. IIRC
NGK's, the oe ngk is B8EVX for them
You'll need to do a fair bit of checking on it mofo, A lot of ways to get easy power as well on them.
You have valve gaps, lots of crappy pipework and so on. Most that haven't been fiddled won't be making stock boost, also is the exhaust been tinkered with i.e. a free flow job the boosts probably low cos the backpressure line into the exhaust from the wastegate.
The oil pressure gauge work? most don't, its on a wee line at the front of the block on em.