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The 2013 Dunlop MSA British Touring Car Championship is a multi-event motor racing championship for production based touring car racing 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 will be the 56th British Touring Car Championship (BTCC) season.

This will be the third season that cars conforming to the Next Generation Touring Car (NGTC) specification will be allowed to compete and the first season since the end of the phased transition from the Super 2000 specification which saw the organising body, TOCA, maintain a performance equalisation between the two chassis specifications. The season will see teams compete with car chassis built to either NGTC or S2000 specification although the NGTC cars will have a significant performance advantage over the S2000 cars. They will achieve this by giving NGTC cars a significant increase in the turbo boost pressures which they are allowed to run. Teams can choose to use the NGTC 2.0 litre turbocharged engine, or S2000 2.0 litre Naturally aspirated engine. Teams with S2000 cars will be eligible for the newly introduced S2000 trophy named after the winner of the inaugural British Saloon Car Championship in 1958, Jack Sears, known as the Jack Sears Trophy, of which Sears himself will award to the top S2000 finisher of the year at the final round at Brands Hatch based on the amount of S2000 wins (known as 'cups') over the season.

2013 also sees the return of the British Formula Ford Championship to the support race timetable.

Race calendar and results
The provisional calendar was announced by the championship organisers on 29 August 2012, with no major changes from 2012.

Regulation changes

 * Unlike 2012, S2000 and NGTC cars will no longer have performance parity.
 * The amount of change (ie. increase/decrease) in the turbo boost pressure adjustment will be reduced from the current level.
 * Adjustments will be applied to either individual drivers or teams – yet to be determined – but not per car type/chassis as in 2012.
 * The frequency in which the adjustments are calculated is also to be finalised – currently it is a "rolling two-event" average.
 * In all events except Thruxton, drivers will be required to use a new softer compound of Dunlop tyre in one of the three races of the day which will offer "superior performance to the standard compound tyre." However, they must nominate which race they will use them in prior to qualifying. They will have distinctive markings so that rivals, spectators and TV audiences can see who's using them.
 * Cars must now have a matching set of tyres. They are no longer permitted to have a mix of wet and slick tyres.
 * In addition to the fines and licence points system in 2012, from 2013 if a driver receives three warnings; verbal or otherwise, they will be relegated six places on the grid on the third penalty.