yep, those are technology issues. but one could also say the e36 is a technology issue. auto technology made huge gains in the 20 years between the 240z and the 325is. a simple hp/lb formula cannot capture the difference in potential between different generations of technology.
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GASP!

But...but...but, Marshall, the "formula" is everything!

The SIR doesn't have to be tested---the "formula" says it will work! The "formula" and the "process" are sacrosanct and they are everything! They cannot be doubted or questioned! Do you want to be labled an infidel and an apostate?

Repent now!!!