Everyones done this !! seems pretty safe as long as car doesn,t have too many mods.quite a surge in extra boost,but I was warned that if above max boost for car ,then watch the top or bottom end drop out.
I have mine out ,but need a boost guage to see exactly what psi its running.
Some guys have had neg results.
Blitz e-mailed me back to say that if I had the restrictor removed then my car wouldn't benifit from there exchange ecu replacement.
As well as having SS exhaust, air filter and dump valve.
But it does have an effect.
cheers
Paul s