I autocross a stock 90 crx dx. Is a stock 89 civic SI going to be "that much" more of a performance gain over my current 90 crx dx?

Yes I know that the 89 civic si has won a few years of STS, and it's made a pretty good run at HS class as well.

I know this was an autocross question, but I figured crx and EF civic owners would read this forum more.

So what do you guys think? I already bought the car, but just wanted some reassurance from others as to what they think.

 

more hp/tq, rear swaybar, lower final drive-advantage Civic
short wheelbase-advantage CRX

I'd go to the Si in a heartbeat

 

I know it's got more hp and tq, rear swaybar and a higher final drive, 4.25 to 3.88, BUT the hatch is like 70 lbs heavier, and 8 inches longer I think.

Guess I just have to see if i'm faster in the hatch, than in the crx. Still think those other things outweigh the 70 lbs and it being longer?