For the 46, I saw a cuban forty that was perfect for this engine. Its in an article and I will dig it up for you if you want. Its an ARC, but none of the c*** you can get. I think its designed for the 46FX and pipe. The Zens are also good, and EZ have released an Alliance, for around that range. Not sure what exactly what engine size though.
For the 160, anything you want really. Check out the www.znline.com or www.plprod.com
They are the main manufacturers around now, although there are alot more.
Hope this helps,
Robert.