Ok I am going to a true dual setup. I need to know what pipe is coming from each header. So I can pick the size of xpipe tubes. also I am going to be running 3 in 3 out 1 chambers becasue I already have one. I am thinking it's either 2 or 2.25 but not sure

 

I'm not totally sure, but if you can get a tape measure under there and measure the circumference of the pipe you could find out. A 2" pipe is roughly 6.25" around and a 2.25" pipe is roughly 7" around.

 

thanks I will find out shortly.