I agree with the extra nitro comment, but muffler choice is not always about increasing power. I offered the Turbo-Jett as an alternative because it fits wholey within the cowl and is 2oz lighter than the stock 1.20AX muffler with extension piece. The Venus II tends to me nose heavy and anything you can do to reduce the weight up front helps considerably.

In my case, the Webra is not supplied with a muffler, so i purchased the Turbo-Jett which was cheaper, better fitting and higher performing than the available Webra Options. Power wise, my engine falls somewhere between a regular .91 and the 1.20AX but i will be a half pound lighter in weight which i hope will make up the shortfall.

If i need more power i can always move up to the 1.20AX.