Question: The 1986 European Touring Car Championship features heavily modified road-going cars and is popular in what countries?

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2013 British Touring Car Championship: The 2013 Dunlop MSA British Touring Car Championship was a multi-event motor racing championship for production-based touring cars held across England and Scotland.  The championship features a mix of professional motor racing teams and privately funded amateur drivers competing in highly modified versions of Family cars which are sold to the general public and conform to the technical regulations for the championship.  It is one of the most popular domestic motor racing series in the United Kingdom, with an extensive program of support categories built up around the BTCC centrepiece.  It was the 56th British Touring Car Championship (BTCC) season.

2018 British Touring Car Championship: The 2018 Dunlop MSA British Touring Car Championship (commonly abbreviated as BTCC) is a motor racing championship for production-based touring cars held across England and Scotland.  The championship features a mix of professional motor racing teams and privately funded amateur drivers competing in highly modified versions of family cars which are sold to the general public and conform to the technical regulations for the championship.  The 2018 season will be the 61st British Touring Car Championship season and the eighth season for cars conforming to the Next Generation Touring Car (NGTC) technical specification.  The 2018 season will also mark the 60th anniversary since the series’ introduction.

2012 British Touring Car Championship: The 2012 Dunlop MSA British Touring Car Championship was a multi-event motor racing championship for production-based touring cars held across England and Scotland.  The championship features a mix of professional motor racing teams and privately funded amateur drivers competing in highly modified versions of family cars which are sold to the general public and conform to the technical regulations for the championship.  It is one of the most popular domestic motor racing series in the United Kingdom, with an extensive program of support categories built up around the BTCC centrepiece.  It was the 55th British Touring Car Championship (BTCC) season.

Tomas Engström: Tomas Engström (born 18 January 1964) is a Swedish auto racing driver.  He is married with four children.  In the 1990s he dominated the Swedish Camaro Cup, winning five back-to-back titles between 1994 and 1998.  Since then he has mainly competed in touring cars, driving in the Swedish Touring Car Championship since 1999, when he entered an independent Chrysler Stratus.  After this he managed and drove for the Honda Racing Team in a Honda Accord, with his best season for the team coming in 2003, when he finished third overall.  Also in 2003, he competed in four rounds of the European Touring Car Championship.  In 2007, he was runner up in the S2000 Class of the European Touring Car Cup.

Touring car racing: Touring car racing is an auto racing competition with heavily modified road-going cars.  It is popular in Argentina, Australia, Brazil, Britain, Germany, Sweden and Norway.

2004 European Touring Car Championship: The 2004 FIA European Touring Car Championship season was the last European Touring Car Championship season.  For 2005, the European Championship would become the World Touring Car Championship, and a one-off European Touring Car Cup would be held.

European Touring Car Championship: The European Touring Car Championship was an international touring car racing series organised by the FIA.  It had two incarnations, the first one between 1963 and 1988, and the second between 2000 and 2004.  In 2005 it was superseded by the World Touring Car Championship, and replaced by the European Touring Car Cup since then.

1986 European Touring Car Championship: The 1986 European Touring Car Championship, known in 1986 as the FIA Touring Car Championship, was the 24th season of the European Touring Car Championship.  The championship was run to the FIA's international Group A touring car regulations.

2002 European Touring Car Championship: The 2002 FIA European Touring Car Championship was the 29th season of European touring car racing and the second season of the European Touring Car Championship.

1987 European Touring Car Championship: The 1987 European Touring Car Championship was a motor racing competition for Group A Touring Cars.  It was the 26th European series for Touring cars and the 19th to carry the European Touring Car Championship name.  The Drivers Championship was won by Winfried Vogt driving a BMW M3 and the Manufacturers’ Championship by the BMW Linder #47 entry.

Supporting paragraphs: 1986 European Touring Car Championship Touring car racing
Answer: Argentina, Australia, Brazil, Britain, Germany, Sweden and Norway.