Bugeye79

hi all im new to the forum so just wanted to say hello... and new to the Subaru world picked a 2001 bugeye wrx up 2 weeks ago 85000 miles in great condition and I'm in love with it 😍😍 it's been remapped to 270 Bhp and had one cat removed pro drive exhaust fitted 4 brand new tyres fitted 2 weeks prior to me purchasing it to it .... it had a cobb cold air induction filter fitted to it but I have put the standard air box and panel filter back on the car so cut along story short when I'm driving about 70 mph when I i put my foot down the boost gauge Fluctuates between 0.5 bar and 1.0 bar and so does the car I've had a smoke test done on the car which showed that the dump valves was leaking so I've bought a new forge dum valve fitted that and still having the same problems I've also cleaned the boost solenoid with some brake cleaner still no look 😞 Any help would be much appreciated