a similar arrangement of two spark-plugs. However very few small capacity engines did eventually implement such a scheme in their production prototypes. Patent infringement In September 2007, Bajaj Auto filed a claim accusing that the development of TVS Flame was in violation of their patent for DTS-I. TVS Motors decided to sue Bajaj Auto for libel. In February 2008, the Madras High Court in Chennai restrained TVS from launching it with the twin spark plug technology. TVS appealed against this decision, claiming that crucial evidence was not taken into account and in March 2008, launched the Flame with a modified engine containing one spark plug. The DTSi idea is a simple one to understand – it involved usage of two spark plugs (instead of one) per engine cylinder. On 16 September 2009, the Supreme Court of India permitted TVS Motors to manufacture and sell the 125 cc TVS Flame with Twin Spark Technology until the pendency of the suit before the Madras High Court, but it shall maintain accurate records of its sales all over the country. ExhausTEC ExhausTEC stands for Exhaust Torque Expansion Chamber, a technology patented by Bajaj. The technology involves use of a small chamber connected to the exhaust pipe of the engine to modify the back-pressure and the swirl characteristics, with an aim to improve the low-end performance of the bikes. The ExhausTEC technology is claimed to be highly effective in improving the low and mid-range torque. Copy of Pulsar brand motorcycles There were several allegations of IPR infringement by Chinese manufacturers in Sri Lankan and South American markets. Pulsar clone versions are sold in Bangladesh also. The 'Tomahawk' motorcycle manufactured by Hong Kong-based Giantco Limited, 'YB200' motorcycle manufactured by China-based Taizhou City Kaitong Motorcycle Manufacture Co., Limited (the company which made a clone of Piaggio MP3), 'ZX200-7(G) and ZX200-7(II)' motorcycles manufactured by China-based Jiangsu Zhongxing Motor Group Co., Limited, 'RT150-8' motorcycle manufactured by China-based Chongqing Rato Power Co., Limited, 'SM150-GB’ motorcycle manufactured by China-based Pantera Motorcycle Co., Limited, 'HJ200-23' motorcycle manufactured by China-based Guangzhou Panyu Haojian Motorcycle Industry Co., Limited, 'VL150-30, VL150-28 & VL150-26' motorcycles manufactured by China-based Veli Technology Industrial Co., Limited, 'SUM200 Pulsar' motorcycle manufactured by China-based Chongqing Union Co., Limited, 'YG200-7A' motorcycle manufactured by China-based Chongqing Yingang Sci.&Tech.(Group) Co., Limited and 'YX150-CS' motorcycle manufactured by China-based Chongqing YInxiang Motorcycle (Group) Co., Limited are some famous replicas of Pulsar brand motorcycles' Bajaj Pulsar