You deffinitly dont want that exhaust. Its the same size as stock.
The reason you liked the sound. When they rev it notice the black smoke. That tells you two things. One its untuned and two its catless. You like the sound of the exhaust without cats. Add in the fact that its in a inclosed building its like driving in a tunnel. The sound is different. So you can sound almost the same. On a stock exhaust just take out the cats.