Who the GM winning team when the EP winning team was #37 Porsche? 
CREATE TABLE "table1_29225103_2" (
  "rnd" text,
  "circuit" text,
  "ap_winning_team" text,
  "bp_winning_team" text,
  "cm_winning_team" text,
  "cp_winning_team" text,
  "dm_winning_team" text,
  "dp_winning_team" text,
  "em_winning_team" text,
  "ep_winning_team" text,
  "fm_winning_team" text,
  "fp_winning_team" text,
  "gm_winning_team" text,
  "gp_winning_team" text,
  "hm_winning_team" text,
  "hp_winning_team" text,
  "results" text
);
SELECT "gm_winning_team" FROM "table1_29225103_2" WHERE "ep_winning_team"='#37 Porsche';