Question about mods for 2.5 RS

Hi Everyone

I was wondering if someone could please help me out. I have a 1999 Subaru Impresa 2.5 RS with automatic transmission. Stock is 165hp and 166 torque.

Does anyone know approximately how much power would be added if I installed a torque converter geared toward low end power? Does anyone know a good one out there?

Also if I did install a torque converter, new exhaust, & cold air system what would that bring the hp & torque #'s up to? And any guess's on what the 0 to 60 time would be?

Thanks in advance for anyone's help.
Take care
JC

hey man, i have a 2000 2.5RS, 5-speed, and i recently put on the standard ricer mods, APEX cat-back exhaust sys. and an injen cold air intake. i haven't actually checked the hp rating but i dont think its much, i have noticed a little better throttle response tho.