Filling in gaps in my Hebrews book...
... N. T. Wright substantially agrees with Dunn on the question of works of Law. Even before Dunn began to popularize the phrase, "new perspective," Wright had written that Israel's problem, according to Paul, was not legalism or an attempt to become righteous by doing good works. Rather, Paul saw Israel as guilty of "national righteousness," "the belief that fleshly Jewish descent guarantees membership of God's true covenant people."  Dunn agreed. 
We see this sentiment play out especially in Paul's letter to the Romans. Dunn writes, "The 'boasting' of the 'Jew' in Rom. 2:17-23 is certainly to be understood as a boasting in covenant privilege over against the less-favored, or rather passed-over Gentiles"  Dunn assents to what Brendon Byrne has written similarly of Romans 10:3. In this verse, Israel is said to have attempted to establish its own righteousness. Byrne writes, "'their own righteousness' ... can only mean the righteousness of Israel as holy people separate from the sinful rest of humankind." 
Wright and Dunn thus shift the sense of boasting in Romans from a sense of boasting in individual righteousness, because of an individual's good works, to a boasting in one's race, one's Jewishness, over and against non-Jews. Similarly, the works in question are not just any good works but especially those works of the Jewish Law that most differentiated Jew from Gentile in matters like circumcision, food laws, and Sabbath observance. The so called "new perspective" thus pulled the trajectory of Pauline scholarship out of the clouds of a generalized and universizalized Paul, the Paul of Augustine and the Reformation, and back down to the concrete earth that was the real world that Paul was navigating as he conducted the Gentile mission...
 "The Paul of History and the Apostle of Faith," (1978), in Pauline Perspectives, 6.
 E.g., "The New Perspective on Paul," (1983), in The New Perspective on Paul, 114-15.
 New Perspective, 9.
 "The Problem of Nomos and the Relationship with Judaism in Romans," CBQ 62 (2000): 294-309, esp. 302, quoted in Dunn, New Perspective, 11 n.40.