The same reason all the other galant GSX members come here. The same reason you have Evo and DSM members. Because we all share a common interest and would hope to help one another.
There are two parts to ground off when correctly setting the BISS in the turbo models. I would assume there is also 2 in the non turbo models since the motor is the same. One is on the passenger side near te fender, one in under the sash usually just right of the fuse box. Mine is not there. I'm to assume the location is different on a galant GSX. Thus me asking, as I'm sure in 23 years someone with a galant GSX has set their BISS correctly.