Which spark plugs for the 103 bhp 2.0 EFi?

[Jeroen]

My 2.0 EFi engine runs perfectly, but out of curiosity I've checked if it has the right spark plugs and if they are in healthy condition. It turned out that all four spark plugs are for the 1.6, namely Unipart GSP 4562. According to the car manual they should be Unipart GSP 4452. How bad is this? I have only driven a few hundred miles in the car, but the former owner might have driven for years with the GSP 4562 plugs.
My second question: Are there good alternatives for the Unipart GSP 4452?

[Jeff Turbo]

An efi has 115 bhp, carb has 105.
And efi runs better with NGK sparkplugs. If you search on here there are several posts about ngk plugs. You won't find many unipart spark plugs these days

[Jeroen]

Thanks for your reply. However, the first years the EFi had 115 din hp and the EFis made in the nineties had 103 DIN hp, possibly because the first years they were not fitted with catalyzers.
I'll search for posts on the spark plugs now.