Nah, the 70hp is for an earlier model engine that wasn't used in the DX. The DX trim level has a D15B2 which is rated for 95hp. I find that power wise the DX without the AC on is the same as the SI with the AC on. The DX does have more body roll but you could probably take the antisway bars off your SI and put them on the DX if it bothers you.
Not sure that they do have different transmissions. All of mine have serial numbers of SL3-serial#. I'd think that it'd be different if they are in fact geared differently. They both spin at 3500rpm @ 75mph in 5th gear. Either way the DX does get better gas mileage.
Would be a little concerned with how that body kit was installed. I've seen one that was attached with woodscrews. It was rather loose because the sheet metal had started rusting out around the screws.
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