Haven't heard it flashing. Silence is golden. If you're asking if the alarm still works but silently, I don't know....I'm just happy it's quiet. I'll push the panic button tomorrow & see what it does.

Eurotune is an ECU tune good for a few extra horses.
Sprintbooster is a gadget that attaches to the gas pedal removing the drive-by-wire throttle lag.
Some say that if you have the tune you don't need the Sprintbooster. I only have the tune so I can't say, but I can tell you the tune is worthwhile.