Hey all

I am building a p-51 and trying to decide between a DLE 55 and 61. Both will fit (55 a little better) but the 55 does come with rear exhaust pitts muffler where as with 61, I would have to buy a wrap around. My question is for a non 3d plane (just speed) am I going to see a -significant- difference in top speed between the two?

Thx
Z