Spark plugs for LCR mk1

[x4d0w]

I'm thinking in buying a spare kit of spark plugs for my 2003 LCR and want to know if the following spark plugs are good
NGK IRIDIUM IX SPARK PLUGS SEAT LEON CUPRA R (HEAT 8)
I found them costing £33 the 4.
Want a spare kit just in case I need to change them.
other thing, what coilpack should I buy too and what changes for better can I do in my car?
I had a 2001 seat Toledo 1.9tdi, but I'm new to the petrol engine.
My car have some mods, but do not know if it is remapped or not (AMK engine).
What advises and changes for better I can make?
Appreciate your help.

 

[mbradl3y]

You can't go wrong with NGK's. Iridiums are worth the extra cost.

 

[x4d0w]

what is the difference of between the normal Iridium and the ones that I wrote? Iridium Heat 8?????

 

[Andrewwright]

Some mods? What mods? What does it boost to? What PSI/bar. Not sure on what stock is on a LCR as I have the non r cupra but looking at that will tell you if it's been remapped or not. I'm sure stock LCR is 15psi

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