I only recently installed dawes and needle valve. ( blocked egr ) . better boost curve . no lagging . you can get all these parts off Mudski . It took a while to fiddle with , but once it was set it was great . definitely peace of mind .
turbo timer if you haven't already done. I've owned a few turbo cars in my time . always had turbo timers to cool the turbo. ebay sells the BOGAARD ones specifically made for zd30 . Was literally plug n play . installed it in 10 mins @ around $230 was worth it
I helped a mate install his snorkel on his GU 4500 the other week . Just make sure you don't have to go any where in a rush . It took a couple of hours to do . He bought Genuine Nissan one. It was quite average quality I reckon . We had to cut a hole in the qtr panel and the middle guard which is connected to the engine bay . The instructions never indicated that. It did look good after completion
Things handy to have : - Dremel , Touch up paint pen for bare metal. .If it is 200 bux to install it , I would pay to have it done . I don't have the patience to stuff around with it . One of those things to be done properly ONCE