i hope i dont sound dumb asking this, but where exactly is the LIM? and is it hard to replace? or hard to get to? because i was thinking of getting the P&P UIM and later get the P&P LIM. good idea? or bad idea?

it's the lower intake manifold. the upper intake manifold connects to it, and the fuel rail runs between them.

it's probably not a job you'd want to tackle yourself if you're not even sure what it is.

i'm sure someone else has had this done and can give you an estimate on the cost.

Yep the intake on a 3400 is 2 pieces uppper and lower they just bolt together to make 1 unit.

oic! so do you think its a good idea to get just the UIM P&P or do you think its a good idea to get both?

i've heard its hard to get more air into the LIM, and not worth it.

but i cant personally provide that advice for you.

I would say both, especially since RSM sells them together.
http://www.rsmracing.com/portedintake.jpg, pic of manifolds together
http://rsmracing.com/us/main.htm, main page for RSM, go to Oldsmobil, then Alero, then 3400. I would say get both ported because, as everyone says, you only get as much airflow as the smallest hole in the engine will allow. No point in porting the upper intake manifold if you don't port the lower intake manifold.

I think that is not the right pic. THe linked pic showes a 2.4 liter intake a Upper intake manifold for the 3100.

Yeah get them both. Why take apart your motor more than you have to.

Cost me about $400 to get the manifolds and TB swaped out, but my mech def cuts me a lot of breaks

that is a good break, i have gotten several quotes for this work in the $600-$800 range.....

Yeah, I know the one on the left is for the 2.4, but the one on the right maybe only the upper for the 3.1, but it shouldnt' be much different for the 3.4. That is the picture that they have on their site.

The Intake for the 3400 is the same.

ken your mech cuts you breaks all the time. i calculated it up and my total will come to around 700$ i only have 400$ right now so i just think i'll worry about that new TB and the manifolds another day.