INSERT APEXI ECV! This has a more resonable price($125-$250). Can be controlled via throttle, cable or with a solenoid of some sort(wastegate, electric, blah).

80mm - $150
http://cgi.ebay.com/ebaymotors/APEXI-80MM-FLANGE-ECV-EXHAUST-CONTROL-VALVE-SILENCER_W0QQcmdZViewItemQQhashZitem518b9b5130QQitemZ350234562864QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5 fAccessories

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1997 Mercedes E320 Turbo
Garrett T3/60-1 Turbocharger
Custom Water Intercooler Setup
352rwhp/366rwtq @ 8.6psi in '08

http://img78.imageshack.us/img78/1051/log7smallay9.jpghttp://img66.imageshack.us/img66/740...s3smallox0.jpg