keep the stock manifold, it will out flow the turbo. also is the manifold (headers) flanged for a ct? if not you would need an adaptor. as for the question about whether or not you can block off the internal wg, dont see why not, but why bother?
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88 N/A w/ 5spd - stock - not running, bhg
87 turbo/targa w/ 5spd- fidanza light weight flywheel, new oem slave cylinder, apexi air filter, no ac and no heat
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