The Million Card Cup was a Honda Civic-only race that took place in Japan from 1991-95. It was a fantastic snapshot of a (relatively) inexpensive series when the Civic was at the height of its tuning popularity. A round, held at Suzuki Circuit showed the prodigious number of EG6 hatchbacks intermingling with a few older EFs, all with high-revving naturally aspirated VTEC engines wailing away.
The cars weren’t too heavily modified, just gutted and equipped with safety equipment, wheels, and a few bolt-ons. The B16A engines appeared to be mostly stock, but they weren’t the 125-horsepower single-cam D16Z6 engines we got in the US on the Civic Si. These were 168-horsepower, 116 lb-ft twin-cam version found in the Japan-market SiR, and they were incredible feats of engineering of the era. With cars largely the same, these one-make races looked like an absolute blast.
I have vague memories of a Canadian Honda Civic Challenge that ran in the 1980’s
There was! It started in the late 1970’s and ran to about 1991 or ’92. It was sponsored by Honda and Michelin tires. It was briefly revived in 2004-05. At it’s peak there were 40 to 50 entries and ran at Mosport, Mont Tremblant and Circuit Gilles Villeneuve.