BigPoch not a solution to your problem but I wrote a guide about doing a chip repair on your windscreen if it's any help for you fixing the chips you do have and hopefully stopping them from possibly turning into cracks.
Link: http://www.350z-uk.com/topic/108635-how-to-windscreen-glass-chip-repair/
Welcome aboard.
Some info to look through here for you below.
Youtube buyers guide/fixes: http://www.350z-uk.com/topic/110679-youtube-350z-buyers-guide-fixes/
350Z service schedule: http://www.350z-uk.com/topic/31110-service-schedule-for-a-350z/
Guide for new members/potential buyers: http://www.350z-uk.com/topic/56870-guide-for-new-memberspotential-buyers/
Another buyers guide: http://www.350z-uk.com/topic/77426-buyers-guide/
Top 100 FAQs: http://www.350z-uk.com/topic/24796-top-100-faqs-must-read-wip/
Welcome aboard John.
Re; the picture size limit ~ if you use Photobucket you won't have that problem.
Link: http://www.350z-uk.com/topic/103472-how-to-add-your-photos-to-the-forum/
If you're getting a new exhaust system and HFC's they will be stainless steel surely won't they?!
The HFC's definitely will be and unless you're getting an OEM exhaust system then most aftermarket exhaust systems are stainless steel or better so you won't need to worry about corrosion on those.
If you mean the standard exhaust manifolds then I really wouldn't worry about corrosion on those either and if you are seriously thinking of wrapping them then the amount of money it will cost to get to them done would be ridiculous. You'd be better off replacing the OEM manifolds with some aftermarket ones if you're seriously going to the hassle of having the old ones removed for wrapping.
I just assumed "TOOTY" was post boosting in order to try & sell something on here within the next few days.
Guess I can stop checking their content now.
Personally I'd remove the non-return valve from the equation all together.
It really isn't needed and my windscreen washers were a lot more powerful after I removed mine replacing it with a straight through piece of pipe. Try that first would be my advice.
Your best bet is to go on Autotrader and Pistonheads to compare like for like cars. Very easy to do especially on Autotrader, ...if you're registered with Autotrader you can also ask them for a valuation.
Good luck.