Camshafts of the S3 are closest to the very popular but extremely rare GT cams
These cams can be modified to fit in an S4.
or even regrind to GT specifications or use as they are.
928105291 3R E1-4
928105292 3R E5-8
928105293 2R A1-4
928105294 1E A5-8
S3's required higher compression 10:1 pistons to compensate for their long duration cams which reduce intake charge pressure
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