1) those oil mods wont solve the GTR's problems, they help you at the track and changing filter, but as far as stopping them from spinning a bearing, you really need the sump off!! you can actually do the sump mods with the engine in the car, there actually is a way to take the sump off with the engine still in place! and you want to enlarge and baffel it! the other important mod is the restrictor in the head...not that easy to do, you may be able to do it from the bottom with the sump off tho, but expect to pay $$ for this
2) umm.. okay, why? u know whats on there atm? any particular reason you have singled out this part of the exhaust?
3) pods with shroud or box... once again, for a stockish car why would you want to change them?
4)
a) you having problems with the clutch at the moment? untill it start failing why change?
b) anything with a mac valve, they are the best type of electronic presure control!! (profec b spec 1 has it)
c) perhaps were starting to move away from a lightly tuned gtr?? stock turbos? its going to depend on your current plans, remember if were talking stock ecu there is only so big you can go
d) from the fourms "The answer on duration depends on what RPM range you are targetting, be realistic.
If you intend to use 7,000 to 9,500 rpm, something around 272 to 288 degrees would be the go.
For 5,500 to 8,000 rpm, around 260 to 272 and for 4,500 to 7,500 rpm then 248 to 260 is the go.
That's a simplification, but you get the idea. As for lift, once I know the effective rpm range,
I then choose the highest lift I can for that duration. What valve springs you are using will also determine the maximum lift" just note that once you get over 10.25mm lift you need new buckets as well as springs, you may also start to get clearance issues if you go much higher lift. but once again i ask why??
e) obv if your doing injectors u'd do this
perhaps its better for you to list your goals and we can go from there, but there is ALOT you do need to consider (as your finding out) and alot of the time you do one upgrade and you look at thing having to do 3 more for it!
i can see what your thinking... get the car up to a good base to work from there, but it depends on your 'current' end goals, you might not need to do some of this, and you might want to look at other things instead
cheers guys... but MORE delays!! =\
who quits work the week before they start on my car XD