[Evangelion]

Well now your looking at dohc vs single cam (regular)... both engines have extremely close HP most likely 3 -5 hp with in each other, i know the 3.8l out of a 98 is 200hp and i think the 3.4 is 195 or 198 something like that.

3.4 dohc - with some head work i suppose you could look at some nicer dyno records but you gotta put into perspective that means 4 cams..and a BELT ... you could custom turbo it, good luck finding a supercharger that bolts in with little to no problems.. as you can see im not a personal fan of the 3.4 but its still a nice engine and untill GM pep'd up the 3.8 it was the best managable v6.

3.8 - Stock, this engine comes with one major flaw, at 90k miles the extreme heat from the EGR dumping into the lower intake manifold that has a valve that dumps into the upper (plastic) intake manifold melts into a water jacket sitting a mer 2mm from the hole, thus causing small amounts of water to be sucked into your engine over the coarse of 3 days untill on day it doesn't get compression.... (yes this was a personal direct experiance with a 98 3.8 liter *sigh*) ..... however you slap a supercharger that comes with the supercharged Grand Prix you take care of that little problem, get some different pullies and some head mods from SLPerformance.com and you can probly push 300 to the ground.

As for the GM 4-bangers... i am very unimpressed... you can do some major engine and intake (turbo) mods and maybe get something kinda fast.. but i wouldn't mess with them personally.