hi iqbal,
just recently joined loc ,i currently have a 1998 s4 ls400 i think that a feels more respnsive compared o the s3 due to the vvti engine ,xenon
lights are reeally good ,vsr, factory sat nav (which im not a huge fan of ) other than that the suspension feels simular to the s3
quality of leather feels alot lofter ,exterior wise i think the s4 looks alot nicer facelift front end and polished alloys , overhall a refined car ,i previously
had a 1996/n s3 which i thought was perfect but the series 4 goes that little bit further with the added bonus of these creature comforts ! hope that helps nadeem .