The C5 dual-9" booster will not bolt up to the first-gen F-body firewall without modifications to the firewall and/or the booster bracket and push rod, but it can be done. There have been a few threads here and on pro-touring.com with similar installations, both with C5/C6 boosters and 98-02 F-body boosters.
We suggest running a 15/16" to 1" bore MC with vacuum boosted applications, depending on the level of vacuum, size of the booster and pad selection to a certain extent. Single 11" and dual-8" have approximately the same effective area, but about 25% less than the dual-9" for reference.
Tobin
KORE3
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