Defo get yourself the Novarossi P5 XLT and u will be happy for a long time with this engine, the XL spec shows 2.6hp, the XLT shows 2.7. Need i say any more about power difference. Main thing with a turbo plug i find is that they last for absolutely ages compared to the standard plugs. And cant say for sure that they dont affect bottom or top end performance, that is the theory though, i always heard they did but not prepared to argue that