Good spot. The M2-1028s certainly did originally have the usual washer bottle. Its possible the owner fitted the version that sat in front of the radiator, and normally found on ABS equipped cars.
Over the years, on the 96, I’ve had a variety of intakes
As it was in 2005 when I got it
Then added a ARC cross over pipe
Then I managed to complete the ARC intake for an unbelievable price
Then, when I thought I was selling on the car, I sold the intake box. Even though I tripled my money, it was a huuuge mistake. Because I ended up keeping the car. On went a cheapie generic filter
As years went on, the cotton filter was looking manky, and on went, for an extremely brief period, a Ripspeed mushroom filter.
Really bad design. On the HKS filter, the filter cage is secured by a bolt and captive nut. On the Ripspeed, its a bolt and non-captive nut. I had visions of the thing shaking itself apart, and the nut doing god knows what.
Now a Ramair filter.
On a S-Limited, I fitted a filter and heat shield from Fast Eddies, I think all in £40. Looked alright.