I have an annoying issue with my car when i boost it and only when on boost the power delivery is interrupted by slight but noticeable surge. Now i never noticed this when i 1st bought the car and since have fitted a diff back and GFB (Go fast bits) BOV. Now suspecting these mods were at fault i have since removed and sold them.
The only other mod i had completed was removing the Air Resonance chamber from the air box in the RHF inner guard...
What could be causing this issue its really starting to annoy me.
The car has done 120,000kms or 74,564Miles so the timing belt and spark plugs have been changed. The fuel filter and air filters are in very good condition!
The boost gauge does not wander when the car surges so im guessing it’s a fuel or engine management related issue?