what made it a "showdown"?

first,they had to qualify,to determine the line-up for the first 15 lap segment.the fastest qualifier rolls two dice to determine the starting line-up.They race three segments,the first two being 15 laps each,and then the last segment (for $1000 ) ten laps.
It's like the" nascar winston"

Chip in the format for the SS was it not 3 segments 1of 15 laps & final 2 of 20 Laps. This was posted on the Delaware site.

first,they had to qualify,to determine the line-up for the first 15 lap segment.the fastest qualifier rolls two dice to determine the starting line-up.They race three segments,the first two being 15 laps each,and then the last segment (for $1000 ) ten laps.
It's like the" nascar winston"

This year the format was a bit different ...

Segment One – 15 laps - One Half Feature Race Points

Starting lineup to be determined based off of time trial results, with an inversion of 2-12 spots, which will be determined by the roll of two dice. Heat race points to be awarded to the top-5.

Segment Two – 20 laps – One Half Feature Race Points
Starting lineup to be set through complete inversion of the first segment finish

Segment Three – 20 laps – Full Feature Race Points
Inversion of up to 12 spots to bet determined by roll of two dice (2 to 12 spots)

Payout based off FINAL segment, $1,000 to win, $4,025.00 total purse.

Ray Morneau (#98) was number one qualifier (and I believe that he set a new track record).
Andrew Perkins (#3) won the final segment after 18 laps of door to door racing with Morneau.