Early Production S13 Chassis is Stiffer?

[s13dan]

I read a long time ago that in the very first six months of production that the S13 front cross member was stiffer and stronger than any other S13's after that.It said that the front cross member was the same as the silvias was in japan, but due to customers complaning about ride qaulity nissan changed the cross member and weakend it in favor of ride qaulity.Sounds like something nissan would do, and I have heard of many peaple claming that there early produstion 240s are stiffer than the later modle ones (S13).I searched and cant find anything, does anyone know of this?And does anyone know when the 240 was first introduced?Earliest I have heard is 8/88.<---thats me!