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[ree]

  Hi peeps as ive had this car for a year now done most bits filters oil, flushes,have not yet looked at the plugs,
i know unreal ,the left bank looks tricky even from the manuel,was wondering if to fit good quality high performance plugs ,and if so what can i fit apart from the norm ?? thanks REE

[Jimbob]

I would say you will see no benefit in anything better than standard GM plugs,

Cheap, and work well.  more expensive just tend to add life, but they loosen over time anyway so still need checking.

[TheBoy]

Seeing as they need retorquing after about 20-30k anyway, just fit the standard GM twins, and replace at 20-30k.