The NGK's will be fine. Im running the Denso IHK24's in my Mk7 GTI (same engine as Tig) on a stage 2 tune with no issues: Denso IKH24 - Iridium Spark Plugs (x4) -Volkswagen MK7 GTI/R & Audi 8V S3/TT/TTS
– VAGPARTS Australia
Note that the NGK's are recommended for tuned engines, not stock engines. The Denso's are essentially a direct competitor to the NGK's - both iridium, both heat range 8, both made in Japan, both similarly priced.
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