I have noticed my car revving higher ie 1600 rpm when started from cold and when the blipp the throttle the revs are back to normal. I also noticed that am using quite a bit of fuel, but have recently put a set of 440 injectors in so could be this.

Ther is also a bit of noise coming from the maf area or boost solenoid as sat my mates WRX against my 1995 WRX for comparison.

Any ideas?

 

Could be MAF but if its using extra fuell then could also be Lambda