Camshafts of S3 come closest to the very popular but extreme rare GT cams
These cams can be reworked to fit in a S4.
or even regrind to GT specs or used as they are.
928105291 3R E1-4
928105292 3R E5-8
928105293 2R A1-4
928105294 1E A5-8
S3's needed higher compression 10:1 pistons to compensate for their long duration cams which bleed off intake charge pressure
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