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Check the earth wires too, but it does sound like the alternator when you say that the light goes out when you rev it.
The cup alternators are 75amp as opposed to the 110amp for the 172/182 aircon models.
Stick with Valeo as other brands tend to fail fairly soon.
Try Renault Wolverhampton...
Couldn't say mate, i've never been under one. The pre cat sensors will be the same for both 172/182.
With my 182 the post cat wiring has an extended wire which meets the post cat, so it uses identical length wires for both sensors.
Closest road tyre will be 195/50/15
Although the physical width of the tyre will be more like 200. The 18 (or 180mm) is the 'tread' width.
58 is the rolling radius in cm.
What exactly are your expectations of the car?
If it's faster lap times, then that can be down to the driver. They are quick cars in the right hands.
Your current setup should be pretty quick tbh, although 400lb springs are only 7kg. A step up to 550lb/100nm springs would be equivalent to...