I just performed a 'major maintenance' on my Turbo S and covered most of the items you are talking about - sans the CEL. Aside from the creaking when driving over bumps my car had no issues at all, so let's call it mainly preventative maintenance. First of all, without a lift I would not have been able to do this. Between all the items discussed my car was in either the upper or lower 2 post lift position for about a month. This is not as simple as adding up labor hours. A lot of the down time was also caused by waiting for parts, maily due to suppliers sending me the wrong stuff.

Regarding some of your questions :

1. Plugs and coils are easy. Passenger side bank gets a bit more involved. Best to do it when some of the engine bay panels have been removed (you will need to do that anyhow to get to the upper control arm bolts)
2. I wouldn't waste any money on any intake gimmicks aside from a good BMC filter. If your screws are corroded, find new ones. Or try to repair things with fiberglass mat (an experience I acquired while racing motorcycles ) Do not fall into the 800$ IPD plenum trap. For that price you can get a flash from FVD, which gives you +100HP. Additionally, these flashes correct for any errors coming from the oxygen sensor, so it serves a double purpose
3. On the matter of front suspension & sway bar, here is what you need :

A] 2 new upper control arms (Lemforder 3568201KT)

B] While the lower control arms each have 3 bushings in them, only 1 of them needs to be replaced on each side (Lemforder 3572901). This is an expensive bushing which runs about 80$, but the alternative is to replace the entire control arm, which will set you back over 300$. Replacing the bushing will require you to find a local shop with a special bushing press, or you will have to build your own homemade contraption.

C] Swaybar

C1. Cars equipped with PDCC :

upper bushings (Porsche 97034379207)

lower bushings (Porsche 97034379307)

links :

Lemforder LEM-3568002 ; OR

Porsche 97034306921, 97034306923, 97034306922

C2. Standard suspension :

upper bushings (Porsche 97034379205)

lower bushings (Porsche 97034379305)

links :

​​​​​​​Lemforder LEM-3567902 ; OR

Porsche 97034306903, 97034306902

Parts can be sourced at your dealership or ‘cost plus’ on-line resources such as Suncoast, Sunset, Pelican parts. In my case I ordered most parts from FCP. They carry both Porsche OEM and Lemforder (the latter being the OEM supplier). In this case it is a no brainer to opt for the cheaper (but identical) Lemforder part, unless you really want to receive your parts in a Porsche packaging.

Hope this helps.

 

Need to order scan tool today - not sure if I should go with iCarSoft PORII or Durametric - there seems to be mixed reviews as to which is "better" - most give quite a bit of weight to the lower cost and simplicity of iCarSoft PORII... What would I be missing out on if I were to go this route and not go Durametric? Any input as to which is best?

 

I have both, the Durametric is definitely better but the iCarsoft one is more convenient (Full laptop versus handheld). If you want to be able to do the max things, get Durametric, if you just want quick and dirty get iCarsoft, or if you are like me and want both get both.

 

About a month ago i removed my bumper for the first time to get all the leaves and crap out of my front inlets and replace my air filter with a BMC. I found that my screws had also corroded, and someone had drilled two holes on each side of the air box and fed wire through twisting the wire until it was sealed.

I left it as is for now.