LC350z

Ok got it will avoid Japspeed, I wasn't really planning on buying a cat back full exhaust any time soon, more would be up for a new y pipe, and back box adjustment as mine works perfectly just the tips arent lined up great, For that I got quoted like 650? I might attempt to do the adjustments and fitting myself but do I stick with another Scorpion Y pipe for 260? as the rest is already scorpion or do I change it out for a different one. Budget ranging between 2-600 only if it's a really good one. As there's plenty in the 2-450 range Miltek, Scorpion, Z1, Cobra, Stillen, Tarmac, ISR Also for additional info the HFC I have found is the 300 cell ISR Pipe so maybe better sticking with ISR Y?

Recently had a service and my exhaust at present time is a full Scorpion catback. Was told my Y sections flex pipe are in rough condition and need fixing or replacing. Was told it would be better looking at a new Ypipe although currently got scorpion ones unsure what to do. Also my back box tips are uneven and too close to bumper so it's melting it abit. They said to look at a full cat back japspeed system as the labour and materials cost would be similar to purchase and labour of the Japspeed K4? I feel like that would be a downgrade as all reviews about Japspeed seem to be bad sound and quality especially with a HFC that I need to replace shortly.

I am looking at buying a 2004 nissan 350z but it has 150k miles on it. Supposedly the gearbox has been changed but what else should I look out for?