i dont recommend gutting the interior if this is your daily driver and/or weekend autox car. you'll throw off the weight balance and the car will become even more front biased than it already is. the car will handle worse and you'll get massive understeer. the trick to weight reduction in a FF car is pulling more out of the front than you do the back.
if this car is for drag racing, then by all means gut the b***h out. pull everything out of the motor bay 'cept the motor tranny battery and radiator, then strip the interior to bare metal and a drivers seat. do all that and you'll probably gain a second on the quarter mile