found this page on the new flat 4 porsche engine that could go ahead, this could be great for my project because its smaller than the flat 6 meaning its lighter and the body can be shorter. they say it will feature direct injection, one turbocharger and a 7,500 rpm red line. According to internet speculation, it is expected to make around 350 hp at its highest state of tune. hmm how about two different sized turbo chargers just like the flat 6 turbo or could it be like a Subaru flat 4?
full report is on http://www.autocarhire.com/travelblog/featured/porsche-rumored-to-launch-new-flat-four-cylinder-engine/