Best upgrade for performance Options

[Nigel]

I'm getting a celica, at least I think I have made up my mind.

Its a UK 2.0 GT celica 184bhp.

What is the best upgrade for performance.
This doesn't include big expencive things like turbos or supercharge.

I was thinking like superchipped £200.
Weight loss?
what else is there.

I want it to stay a good mpg. (as I dont want to pay more on petrol)

[BenMMellor]

we're lucky that the uk club insurance co are quite mod friendly. basically unless you do major mods such as supercharging they don;t add anything on - ok you pay a little bit more than a regular co.
e.g to insure my GT company x wanted £1000, if i wanted to add an induction kit, exhaust or alloys they would increase the premium each time..ie £100 for the intake OR exhaust - the alloys would require another £500 !
With the club insurer I've done the exhaust, some body mods and 17's and a 40mm drop and they only charged me £1050 for a years insurance.. also when i x'fer my other car to be insured with them they will realise i can only drive 1 car at a time and thus give me a discount on the insurance.. the other car (beater) is another Celi btw.

basically like all insurance co's if they can find a reason not to pay the will, if i was unlucky to have a smash I can get it repaired to how it was - but if i hadn't declared something they would void the insurance.. these days it's not worth the risk.