The B5 is more of a truggy engine, if you are going Werks go B2 or B6. The B5 will work fine in a buggy but it is designed more for the truggy. Also if you are stepping up in price for your first engine then I would also suggest getting a good pipe, if you don't have the budget for both then get the cheaper B2 engine with a good pipe or maybe consider the Fusion x3 race or Novarossi P5. Again not knocking Werks as they are great engines with great customer support, but the same can be said for Fusion and Novarossi as well. In any case you should love your Werks engine and pipe.

BTW I know it is different in Viet Nam than where you are but.... the only problem I have really had with the 2058 pipe is getting the correct springs as the Werks, Orion and Nvision use a smaller spring connecting the header to the pipe. This shouldn't be a problem in the US but it is here, so if you get the 2058 and run into t his trouble you can modify the longer springs by cutting the ends off and rebending the ends.