How about this, is the MSDS Y-pipe ok for STS (not G Stock)? It uses the stock cat converter unlike the SHO-shop Y-pipe, which I think is not allowed in STS. I believe the rule says something like CARB certifed headers are OK in STS, but since MSDS deletes the precats the headers themselves are not CARB certified. But no mention on the Y-pipe alone. I would think it would be ok, as most CARB certified V6 headers come with a Y-pipe.
