Privat pilot,
I am considering this exact setup. One of the better pilots at the field today recommended the tuned pipe setup or even a mousse can setup and said it would be well worth it. I currently have a gas engine in mine and though I am very pleased with the power, I really do not like the wing loading. Of course I will then have to buy a new plane for the gas engine
which I really would like to put it in the GP Ultimate Bipe which has about 300 more squares.