Celica Mods Options

[patriboo]

hey dude's.. I recently bought my Celica, a 99 ST. I realise that power wise I'm not going to get much more out of it which I'm fine with.. however I do want to customise it a little...

What suggestions can you guys make, the ideas I currently had were

1) Exhaust, I want a Oval stainless steel exhaust... any one know any any makes that do one.. does it have to be ST specific or would a GT exhaust fit?
2) To give it that nice sound I quite fancied an induciton kit... I notice that pipercross don't do an ST specific model but K&N and Green do! Can you fit a GT kit to an ST?
3) My ST has got all round disc brakes (sweet, must be on the late models as the earlier ones just had drums I thought. My friend always recommended Black Diamond.. however I also see Greenstuff are pretty popular. Is there much difference? Also what are the benfits to having groved and/or drilled discs?
5) How easy is it to change the internal lights/LEDs to red? I've seen the how-to guide and looked pretty simple.
6) I fitted a new headunit but it protrouds out from the dash, anyway to set this back?

Any other worth while mods?

I'm UK based and new to this car modding thing (it wasn't worth it on my escort) so if anyone can recommend any websites as to where to get hold of bits and pieces, especially JDM or TRD parts that would be awesome.

Cheers