Wha company makes a 3" inch Y pipe for a Maxima.... or does everyone just use the 2.5 pipe and only upgrade the B pipe to 3 inch... Since im uping the boost.... to 14

 

I think Warpspeed used to, but when I called last they told me they dont do anything in 3" anymore.
I had a piece of 3" pipe wleded up to the the y section of my headers. Right as they come together its an ovaled 3" pieced that opens up to round piping all the way back.

 

Make it yourself!