2001 s-turbo upgrade

[denbright]

H i , I have a 2001 s-turbo ,I have to replace my exhaust system due to corrosion ,i have got a h&s cat system to  fit. Is it worth up grading td04 turbo ,would i need remap .

I live in Hertford ,helpful advice required ,rough cost etc and recommendation.

Thank you.

[stants]

In theory you should go for a map but form other foz members I know who have gone up to an 04 for the tf03 with no problems, but a map would give you more torque horsepower and better mpg