My buddy has a 06 m7 and he threw a speedwerx can on it, I took it for a ride and it seemed to be lacking low end snap, i told him to put the stock can back on seeing as he never even rode it with the stock can, i took it for a spin and there was loads more low end snap..this a common thing with only the addition of a can or should he rejet? He also said there is a small hole in the can..im guessing thats not suppose to be there?