Bazzersclassic

Hi all I'm new here but have had my impreza for a few months now and think its time to do a few changes.
My impreza is a impreza turbo 2000 wagon my00 it's a uk model on a w plate.
I'm wondering what sort of upgrades I can do I want to get the exhaust upgraded with quotes recieved around £310,I'd like to remap it I'll put a list of upgrades I'd like at the end.the calipers need painting up and the engine bay could use a spring clean any recommendations would be ideal.

exhaust upgrade for a deep scooby burble
Air panel filter
Remap/chip
Already own bov

Hope you can guide me in the right direction.

Tidgy

those are a good starter for ten

Bazzersclassic

Is the torque increase big after all these? If I went for an ecu upgrade which one would I need?