Blow off valve

[0LGT5]

Can I put a blow of valve on my 05 LGt stock turbo?

[TSi+WRX]

Use a 100% recirculated bypass valve or a 50/50 hybrid setup instead - both will keep the ECU happier (the latter more than the former). Regardless, your vehicle *may* experience variable driveability issues with either: there's no telling what will happen - some experience severe driveability issues, others, virtually nothing.

Since you already have an aftermarket intake on the vehicle an aftermarket BOV may either make your overall auditory experience either more interesting or more boring - again, there's no telling.

My LGT on its Perrin conical SRI, with factory BPV, breathed like Darth Vader and was quite an auditory treat for someone like me, who likes those kinds of noises that a vehicle makes....

When I switched to a Blitz SS BOV, all those noises went away, and was replaced with audible noise only when actually venting.

I did not have any driveability issues with the Blitz SS BOV set to full vent, but again, YMMV.