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There's no telling from the outside-short of the data plate-but the once S-Trim V-3 Vortech blowers are now Si-Trim and the old SC-Trims are now SCi-Trim blowers. The S and SC blowers are out of production, superseded by the i-versions. They have improved compressor sections for more airflow and boost, especially at higher power levels. This is Brian's Si-Trim.