With the E-box system, Tecnigas has designed a racing exhaust system for original and 70cc sports cylinders. The length of the exhausts are optimised for these cylinders and thus allow full power performance. Hand-welded system with great character, capped off with a genuine titan-look anodized silencer. The internal construction of the expansion chamber and the subtle sound of the silencer make for a pleasant, deep sound and make it excellent on the road. With E-certification. Thus, the exhaust is restricted in the manifold. A removal of this restriction will invalidate the general operating permit (ABE) and significant increase in performance. Overall, the Tecnigas E-Box is a very good choice for those who do not want to change the cylinder kit or want to make significant tuning alterations to achieve an increase in performance. E-certified, thus suitable on the road. Yamaha or MBK 4Yv (TZR50). The main jet of the carburettor should be changed when fitting a new system. Down pipe and the exhaust system may differ from the product image as this is a demo illustration.