tires and pipes

[honda 400ex 69]

what are the best tires for mud/trail for the 400ex? are the razor 2 tires any good and what about some holeshots. i have bandit xc front tires now but need back tires.

what is the best after market pipe for the 400ex. i was looking at the white brothers e-series pro-mag and sliencer with the header pipe. is that any good

If i was you i would get the Titain Turf Tamers and A bills Thunder Series Pipe they are so good and have great gains all over