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Thanks guys ye it came from Scotland I believe the previous owner did the nc500 in it and then came back down south then I've taken it back north 😂

My 200sx used to suffer badly from heat soak during the summer. It is important as Nerdstrike says. Both the TD and Avo kit have their strengths and weaknesses it's down the personal preference but in short they are the most popular kits for UK cars.

Where do you suppose the energy comes from that makes the post-turbo air charge hot? It's proportionate to the temperature of the air coming into the turbo. Aside from a bit of soak from the impeller itself, it's mainly the compression that increases the temperature - see ideal gas law. The higher the starting temperature the more energy in the resulting compressed air, and the more effort it takes to compress. The intercooler can take 10 degrees or more out of the intake charge, but I don't believe the cooling efficiency increases with temperature as much as the heat of compression does. That's before you take into account the practical effects of a car that heatsoaks at idle and has to drain the engine bay of hot air, instead of just the intake volume. I've lost count of how many times I've seen people complaining about wobbly idles and erratic fuelling from replacing their intakes and filter boxes. Good air supply matters! At least to a point. NA ram-scoops have a tiny effect, and most cold air induction kits trade weather resilience for marginal improvements over OEM offerings.

Halfords got me a CR1632 battery for same day pickup within 2 hours from my local store. Ordered online, 2 hours later and ready for collection. Very easy to replace as well; take the emergency key out and use the small lip on the end to lever the key open using the slot (it's like they designed it that way!).

Speak to Jez at Horsham Developments. He has a Speed by Design turbo fitted to his GT86 and specialises in Nissans and the Toybaru Twins..

I've done some data logs on the intake temps. With just the open HKS intake I was seeing intake temps in excess of 40° above ambient. With the box and wrapping I was seeing 3-7° above ambient and with the box, wrapping and scoop I was seeing ambient to 2° above ambient even after 20/25 minute sessions on track. Certainly seems quite effective.