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Cant answer for the HUD, i dont know, never seen one here. Same for the coolant temp sensor, we dont have that engine here, and it is engine dependant. What i DO know is the coolant temp sensor response has a table in the ECU that can be modified, meaning if you plan to go nistune someday, you can fit any sensor you want and then set the response table.
Transmission mount => get a new oem one, or a nismo one. The nismo one is little harsher but still bearable. All others will transmit a lot of vibrations. I suggest you change the propshaft bearing though, as THAT makes a lot of vibrations. Somewhat cheap part, but a pain to fit. Or just get rid of it and buy a 1part aluminium propshaft. A bit more expensive though.
Radio harness > no idea. I hate electrical stuff on a car.
On my S13 the ECU is located in to the right of the passenger legs, behind a plastic panel. It has a screw for diagnosis... but my engine is a ca18det so it may be different on this one.
Parts :
ISIS is crappy chinese rebranded items. But it is cheap.
I do prefer circuit sport, it is more expensive but build quality is also better. I track these without problem. Also they do fit like a glove, no mods required. I'd say they are the items of choice for someone who just want parts that works. Standard design, standard adjusters, a bit heavy, but good welds and ball joints are nice quality. There is better on the market, but it also is more expensive (like two or 3 times more expensive for SPL stuff -but it is lighter, stronger and has a better adjustable locking system that will not make the alignment guys cry in pain).
Then you get high quality parts, but also way more expensive, like SPL. I think they have a lifetime warranty, and an exchange policy when a new version of the arm you bought is made. Never bought these, so check before, maybe i am wrong about this. They do make high end stuff though.
You can also get aftermarket knuckles, various makes, for various usage. More steering angle, 0 ackerman, roll center correction, lowering knuckles, custom brake caliper mount, you name it.
Finally you have some engineering firms that sell a whole new front suspension system (rear also for wisefab). Not exactly cheap but still cheaper than getting a full SPL system. IMHO well worth it. Whole kits includes knuckes with various geometry changes (height correction, more or less ackerman and so on) and all suspension arms. But this is like 1200-1500€ front and about the same rear.
Check the suspension and roll center thread for more info on chassis upgrades.
Also, google GK tech, TDP and wisefab.
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