15hp/30Nm for the diesel engine

[alexuz]

Hello
I'm new to this forum. I live in Sweden and I'm thinking about maybe buying the Yaris 1.4 D-4D in a couple of months (maybe even early 2007).

I found a place here in Sweden that can give the diesel engine 15hp extra and 30Nm (a total of 105hp and 220Nm). Thats pretty ok I think, the price for this upgrade is about 7000 swedish kronor. That is about 945 USD I think.
Here is a link to the company www.kcr.se

What would you guys think of that engine upgrade and some lowering springs, a nice wing at the back and some 17" rims with good tires?

Would these upgrades give the car a better edge on curvy roads?

EDIT:

I have another question. I have always wondered what a CAI filter and sport system exhaust give to a diesel engine? Will it give more hp or will it just screw up the good milage that the diesel engine gives?