Welcome to the Forum!

I'm with VSTech... you'll get more help over at the Performance section.

FWIW, the "mods" you've done don't add any hp. They might free up restrictions here and there, but at the wheels I doubt you'd see more than a couple.

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1991 300D 2.5 "Rocinante"
2002 Golf TDI "Teen Spirit"
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1984 300D
1966 Mustang I6 3sp
1985 Mazda RX-7 GSLSE
1982 Toyota Supra
1977 Datsun 280z
1971 Datsun 240z