i was just wondering if anyone knows the best number of discs to run for the raptor and the best jets to use for this pipe at about 4500 feet.

 

I'm a little lower in altitude than you are, I'm in Indiana. But I have the E series and I run 12 discs with the 150/155 mains with an open end cap and the K&N with airbox mods - no arrestor. Running the discs with the open end cap still allows the motor to get the necessary vaccum needed. When I run the arrestor (solid end plate) I run a little on the rich side.

Hope this helps out some...

 

I am at about sea level in Maine and I ran 150/155 jets with airbox mods and a good filter and 12 discs with the spark arrestor in because I have been checked by a warden before and he looked to be sure it was in!

 

thanks everyone