If you are so worried about the turbo lag (IMO you shouldn't be), why not look into a Subie 6 cylinder. The EZ motors are light, compact, and make good power. Or, for even less money, the EG33 makes good low end torque, and used engines can be had for as cheap as $500. If I were going to use a blower on anything, it would be a Subie 6, not an M96. Just a thought. Also, The Subie 6's and 4's are interchangeable as far as engine mounting and adapter plates so if you wanted to try a 4 cylinder turbo first and see how it goes, and then later decide to change to the 6, it would be a bolt-in affair.