I simply disconnected my wastegate so it is stuck in the closed position. My 1983 300D makes 15PSI of boost and accelerates better than it ever has before. I dont recommend anybody performing this mod unless you are fully aware of the consequences.

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Matt
2003 Jetta Wagon TDI 145,000MI
1999.5 Jetta TDI 287,000MI
2001 Suzuki SV650S 26,000MI
2008 Yamaha Vino 125 11,000MI
http://www.crazymatt.org