wel that depends on how far u wanna go, i had mine bare, no centre console, removed the bottom parts of the dash, removed the door cards and rear pannel cards, i removed every peice of trim that coverd up things like wing mirror mounts and rear wiper mech, back seats went along with rear speaker and parcel shelf mounts rear top strut covers, spare wheel, front and rear carpets and sond deadening mats, gear stick gaiter and handbrake cover..... seat rail covers, the black peices of trim on the c pillars, practically everything bar the bulk of the dash and the roof lining which i thought about removing but then figured it wud be a pain in the arse to put back wen i sell the car.
IMO, the car looked hideous and was really loud and cold, but my god u could notice the weight difference, transforms the performance and hadling.