Quote Originally Posted by subaru_crazy View Post
My friend has the is300 but stock, he researched and knows that it will take at least 10K to get that car running well when turboed and even then its not a reliable car anymore. And the reason that he's auto is becasue the auto tranny will hold up better, manual will only hold up to 300HP to the wheels, while the auto will hold up to 450 or so, so I have read.
The IS300 does VERY well with mods in a reliability sense.

The only thing you need to worry about is the tranny, and even that will often hold 350whp+ with a decent clutch. There are countless IS300-T's running around with a built tranny and 400-500whp.