hi guys i'm looking to out a 4 branch to my ek9 soon. any ideas on the best brand with costin an arm. which one wau give more power gains 4-2-1 4-1 with out be to loud wen driving normal. i've got a 2.5 full 5zigen system inc cat.
brands, spoon, toda, dc sports, skunk2, mugen, 5zigen...