What is the A/R for the turbine and compressor respectively on the Garret for the 300SD? I am looking to "enhance" my turbo and was thinking of a T3/T4 hybrid, maybe this one:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=150346043205&viewitem=&sspagename=STRK%3AMEWAX%3AIT

Why? Why not?