FMF sst for blaster

[honda_runner]

How much power gain will my friend get when he slaps on his new fmf sst pipe. I have a stock 400ex so im worried.

[Toadz400]

If you are good at riding, you can still take him. Don't worry;) .

Oh..and if you're really worried...tell him not to rejet:p , ha jk...suppose that would make you liable for any damage to his engine:D .