Where to buy an all aluminum radiator
 

I have a 97 A4 quattro 1.8t manual and I'm pretty sure the radiator is leaking. I need to check it out closer as it could be a hose but I'm wondering where I could get an all aluminum radiator. I want to make my car into a bit of a track car so this would be a good upgrade. I would also like silicone coolant hoses if anyone knows where to get those as well.