They called him mellow yellow.
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A recent rolloing road test in redline magazine showed that theses plugs gave no power increase what so ever, The uk importer (can't remember who) was present during the tests & although they tried differant plug gaps no additional power could be found.
Pulstar did claim that there plugs were only good for cars with under 300hp & the test car used was a 225 TT with aprox 270hp, they also claimed that they seen plus 10hp on a stock 1.8T 150 golf but couldn't expain the rolling road results.
Imo this is hardly a shocking result as while it is good practice to run a decent set of plugs they arn't going to produce any higher power readings.
Ewan