hmmmm ok.. yeah i have been reading up on wikipedia (very informative by the way lol) any ways wiki says The 2.9 version had a free flowing 6 centimetres catalytic converter, sharper camshafts, 4 bars (58 psi) fuel pressure regulator, enlarged inlet manifold, and larger throttle body, and when i saw that i thawt that would be fairly easy enuf to put on the 2.8, the most work would be rebore n pistons. In your opinion would u just stick with the 2.8 lump and tinker around with that or go for the 2.9 lump, u see iv got it stuck in my head that watever i do to the 2.8 lump, if i did it to the 2.9