all 182/172's follow the same line of tuning so no need to specifically look at trophy tuning
theres lots of options, and plenty of info on here
here are some ideas:
decat (miltek,yozza,prospeed,gdi) around £50-100 frees the revs and maybe a couple of bhp
exhaust (btb,yozzasport,prospeed,h&s,gdi,janspeed,milltek) around 300-600, free the revs and maybe 3bhp
inlet manifold match to increase airflow (hilpower,angelworks) around 250 and can give gains from 3-15bhp depending on how bad the old casting was
airfilter and cold air feed (simota, maxogen, hillpower) between 150-400 and frees revs, gives a couple of bhp
remap (k-tec, rstuning, rstuner) around 5 ish bhp and extra torque, smooths power delivery and can increase limiter costs between 200-400
the next step is to look at cams which will be around 1000 pound fitted, these will give more torque and around 5ish bhp
if you have more cash then throttle bodies will give you around 220bhp or a turbo conversion will give more but these 2 are where the serious money comes in
the best thing after light engine mods would be to upgrade you discs to something like brembo high carbon, pads to ferrodo ds2500 stainless lines and dot 5 fluid
the suspension is bob on with the trophy so no real need to mess with it
andy