wow, this thread changed a bit, but i'd like to add something if i may ... i'm an old dog from the days of rebuilding big blocks in the 70's; my favorite then was the 396, or the 383's in the Challengers, even the 390 ... so i do love the V8; but i must say the FX35 is extremely impressive, more that enough for me, and she purrs; the sound is almost preferred to the V8, although i wish my gas mileage was better ... so i too thought i need a 45 or 50, but then i can't part with my 2005 as i love the tilt cluster on the dash, the heavyass shifter, and the lighting ( better not to have protruding lights that break easily ) sooo, i'm currently employed at Mahle / Behr and am thinking of punching this 3.5 to whatever with the Mahle piston set etc ... anyone out there with experience?