Whilst comending all ofthe above, might I also suggest the substitution of the big, ugly air box for a nice K&N.
I carried out the swap on my Lux using a kit from the US. Whilst it didn' t fit in the first instance, a subtle modification improved the design greatly over the original.
This tidies up the engine bay considerably, and gives a meaningful growl when you put your foot down. Although increases of up to 10 bhp are sugested I would think this a little optimistic.
I was so taken with the Lux conversion that I' m now doing a similar mod on the Turbo.
Guess what, the same American supplier does a 951 conversion. This time it was so far away from fitting, even I had to give up and send it back.
Following this I down loaded the full K&N product range, sellected my own fillter, fabricated my own bracket, and now await a round tube to square hole converter to finish the job. I' ll keep you posted on how it turns out.
Although missing the induction growl I' d come to love in the K&N' ed Lux, the Turbo conversion was also prompted by an elusive water leak. You can' t see a thing under the air box, and removing it to run the car just to find a leak is not good.
Once completed, my home grown conversion will provide ample access and viewing of sundry potential leaks, growl nicely and may even improve throttle response.
BTW I counted more than 48 places where a 951 can leak water from.