Whats type of pre tuned muffler, thats recommended for the thunder tiger pro46,Im looking for something that comes already tuned and will boost horspower.

Mac's got a pre-tuned pipe that is made for the OS.46 sf or fx. This pipe works just as good for the TT too. I know.. I use one on both of my engines, OS & TT. I gained 1100-1200 rpm on both. There much quieter than the stock muffler too. And the SOUND!! When it "comes on the pipe"... ;-0 yea!
Suptter

I have the new Morris Rossi Round pipe conversion that fits both the OS and TT .46 size engines. The gain seems to be around 1500 to 2000 rpm according to the prop. I am using a 12x4 APC with this muffler on a TT pro .46 and it seems to outperform my Webra 50gt which is saying alot. The transistion is sweet and quite it is not.

Sport, how much is the Morris pipe? Does it come with a header too?
Suptter

I got 1 a month or so ago @ 45.95 complete, ready to use...Suptter, that's the full length pipe isn't it? The "pre tuned" one you mentioned(Mac's)