Maybe a weird question, but im looking for a RS4 Motor. Not in the market at this moment for one, but will want to soon. Where could i start looking for one? Im thinking of pulling out my motor sometimes down the road, and would like to make a swap from an S4 to an RS4. Make my self a little project for the winter months, especially while the GF is at college during the week. Give me something to keep busy after work and out of trouble

Any direction towards a company, website, person with an RS4 motor would be appreciated.
Thanks!