i am building a set of twins got everything done but the piping it is a hx 40 boinb into a sledpuller 66 i just cant figure out the piping any help would be awsome.

 

There are some good pics on here but Piers Diesel has some great pics to.

 

I don't think that would be a good setup, a Sledpuller 66 is way too small to be used in twins as the primary... You can get mild steel 90*'s at some steel supplies for the hot pipe and use mandrel bent exhaust pipe for the cold piping...