Complex sentence: Tuning boxes that connect to the OBD2 diagnostic port that can upload a "generic" performance software upgrade are available, these usually have the advantage of being removable for warranty purposes or for when extra power is not required.
Split into simpler sentences: Tuning boxes that connect to the OBD2 diagnostic port that can upload a "generic" performance software upgrade are available. These usually have the advantage of being easily removed for warranty purposes or for when extra power is not required.