Anyways....



NA has smaller fuel pump, smaller injectors (330cc, high imp), NA head can bolt onto TT block; vice versa, But the intake/exhaust manifolds from the TT are not interchangeable.

If you look in the bottom end you will find factory forged bullet proof crank, hot-forged connecting rods, forged aluminum alloy pistons, and extremely durable rings, the first compression ring being chromium plated, and the piston skirts themselves are coated with a resin to decrease friction. This is on an NA motor, should be the same on TT motor besides lower compression.