i will share mine also since michael use a different way i did... I like to use the stock pipe routing and some friends (honda freaks) tried many ways about where is the best place to stick the throttle (dyno proven) and the way i did it gave them the best performance. This pics are from my old DE with 2.25 exhaust now i'm running 2.5 for the VE but its the same way. And its a Honda throttle body from wich engine i don't know i just know its 2.5".
and for the wire i used a bicycle brake wire ($1...lol) and make a hole in the floor and make the way all the way to the front to fit in the lever to move the pass seat front and back and hold it there when i want noise just pull the seat front and when i want silence pull it back