Have MY99 UK Impreza with full decat, HKS SSQV VTA Dump valve and TEK 2.5 running 17.5PSI Peak boost.

Yesterday, saw some overboost briefly when accelerating in 4th/5h so eased off right away. Have knockilnk, boost gauge and SECS ecu data monitor with oil pressure/temp add on. Never seen more than one flashing green EVER on knocklink including last night, so don`t suspect I had any det., and SECS unit knock correction showing zero.

Today, the boost was very low, and fluctuating, and now little or no boost at all. Checked there was nothing obvios such as any hoses etc.. off, but am a novice regarding this really. anyone got any ideas or pointers. If I cannot see anything obvious am ringing TSL tomorrow who normally service the car.

Any suggestions, checks much appreciated, event if its to tell me my turbos shot!

Graham