F5, 2007 H3 questions

[ChevyHighPerformance]

F5,

The dealer gave me a 2007 H3 as said beat the F out of it and tell them what I think. I noticed some differences. Can you tell me why these changed:

1) The 2007 air box lid has a panel that looks like it was added to the 2006 air box lid. It looks to me like this improved air flow to the top of the air filter and provided some thermal impedance to minimize heating the air reaching the top of the filter. Do you know how much HP this was worth? I'm guessing ~2 HP??? Was there another reason for this?

2) The nozzle that goes from the air box to the fenderwell is bigger in diameter at the end. The 2006 is about 1.7" ID and the new one is about 3" ID. I can see the gain in high RPM breathing. Do you know how much HP this was actually worth? I'm guessing ~5 HP???

3) There is a new MAF sensor design that seems to have a reduced frontal area to the air flow. Is this a new part that will fit the 2006s? Is there a problem with the 2006 MAFs?

4) The spark plug coil packs do not have the heatsink anymore. Is this a better design or cheaper design? Is this a replacement for the 06 coil packs?

5) There is a port that leads into the exhaust manifold. Connected to this port is an electrical valve with a rubber hose that goes to a canister/filter?? mounted to the frame below the power steering res. There is a hose from this res. to the air box base. Is this an air pump system to help light the cat off? Does the 2007 exhaust manifold still have a precat built in?

6) I forgot to check - does the 2007 main cat still have crushed inlet and outlet pipes?

7) Are the 2007 motor mounts the same? The engine wiggled more during starting and it "squeeled/squeaked" more during accelerations?

8) Did the shock dampening rate change for the non-adv. H3? It seems like the spring rate stayed the same. Are the sway bars the same - it drifted in the bends a little different.

9) The rear door shock cylinder rate has changed for 2007 - The door is much easier to shut now.


NOTE - 1 & 2 are good mods for someone wanting to keep the stock setup and get a little more power. I'd remove all the ridges in the air box base and use a tapered filter too - there are better air filter sizes for the stock air box.