T7 uses a mass air flow meter so when you dump charge air to atmosphere it "loses" it and notices. It then gets mad at you.
not sure how the boost controller will do, but the ECU will be confused.
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99 3-door 9-3 - SOLD
99 5-door 9-3SE - td04, 3" dp, t5 suite - Sold
2001 Audi a6 2.7 twin turbo
1986 Audi 5000 2.2 turbo
2012 VW Golf TDI
1982 Yamaha Seca xj650