Mumbai, May 2 : Sajid Nadiadwala's latest outing 'Heropanti 2', a standalone sequel to 'Heropanti' starring Tiger Shroff and Nawazuddin Siddiqui, saw a remarkable 40 per cent spike at the box office on Sunday, despite the unprecedented heat wave and tough competition from 'KGF: Chapter 2'. Sunday evening collections are important for any film, especially one that is looking at an Eid holiday. They indicate a pickup in audience interest in the film and the strong possibility of higher footfalls in the coming days. According to trade pundits, if the film holds its ground till Eid, which it has, it will attract bigger numbers at the box office, and given its steady growth, it is definitely headed towards a good collection. Nadiadwala Grandson Entertainment has a track record of collecting big money at the box office, especially during the Eid weekend, and 'Heropanti 2' being the quintessential mass action thriller is expected to clock strong double-digit collection figures and re-establish Tiger Shroff's reputation as a bankable star. Tara Sutaria and Amrita Singh play the female leads in the film. The production house took a leap of faith and took the franchise to a whole new international level with a stellar ensemble and hit music. The growing box office collections seem to justify its faith in the film. /IANS