Approx. $20 for the Porsche DLC gets you................ (info from Eurogamer)
The pack, which releases on/around 22May introduces 30 Porsche's, with 23 of them returning from Forza Motorsport 3 while seven are entirely new to the series.Ten achievements will be included with the pack. It also introduces a new, bespoke career mode built around Porsche. It's not yet known what cars will be introduced by the pack, but the 23 Porsches previously featured in the series include the Porsche 962 and, of course, a selection of 911s.
Turn 10 also added....
"We kept talking to Porsche, and we kept talking to EA - no-one wants to take Porsche away from the fans. We kept talking and talking until we found an agreeable situation, and now it's win-win. We've got Porsche coming into the game in a big way. EA's satisfied, Microsoft's satisfied and Porsche's satisfied."