im shooting for a single h/f substrate cat this time around. although the smell of burnt (or unburnt!!lol) 100 occy is very sweet, a single metal subs. cat, (downstream from the turbo outlet section) will not affect power output, if at all, and will make the experience a bit more pleasant with the odor control....

the oem cats are best shelved, IMO, for a better performer variety......

es

ps- havent decided on whaich to go with yet, but will post up when i dooo.