God if only I had a sporty at 15 *dreams* took me until I was 23 to get one (my first car).

All I can say is for a 15 year old you've got good taste, just a couple of pointers though if I may;

1. Despite only being 15, if you can get your parents or an older friend with 3rd party cover on other vehicles (most insurance companies offer 3p on other vehicles with fully comp insurance) to drive you to an offroading / greenlaning day out, the majority of them don't care how old the drivers are so long as they can reach the pedals (which there's a strong chance of in your case) as they're naturally off Britains roadways. One such site in the West Midlands (where I live) is Birmingham Offroading Association, bofa4x4.com

2. Sportraks aren't all that well insulated against water, putting a snorkel kit on is somewhat of a pointless endeavour unless you seriously go to town on waterproofing it, on top of that I wouldn't put a K&N on the end of it, it'll become a target for your common chav to nick when he's out drunk with his mates.

My suggestion would be to remove all the normal plumbing and attach the K&N inside the engine compartment as directed here: http://www.daihatsu-drivers.co.uk/node/73 - it'll give you a noticable power increase and it can survive short swims up to the bonnet (and long term swims up to the lights so long as you keep the engine revs up if the exhaust is submerged)

Hope to see you around
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Jason "Foxdie" Gaunt