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I'm planning to change the plugs on my 1998 Mk2 1.8iS. Will having the NGK Iridium make any noticeable difference over the standard plugs? I realise they are 3 times the cost, but assume that is irrelevant.
 

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I'm planning to change the plugs on my 1998 Mk2 1.8iS. Will having the NGK Iridium make any noticeable difference over the standard plugs? I realise they are 3 times the cost, but assume that is irrelevant.
I recently bouht the long reach spark plugs (for NA) and have to say it is a lot smoother and can tell the difference.
Are these worth it no idea
 

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I've tried fancy sparkplugs in bikes & cars before, I found no noticable improvement as such other than a sense of wellbeing knowing that I had he finest sparkplugs in the land located under the bonnet/fairing.

I would guess that if you had a high performance engine and were looking for every last bit of power & torque you could find then it might be a worthwhile investment, but nowadays I use the standard NGK plugs (just a grade cooler to suit the forced induction).
 
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