A single 3" would be ok with Mandrel bends. It will not leave you much room to grow however. Only supports about 339hp. You have 300hp from the factory. Heres a link http://www.exhaustvideos.com/faq/how...pipe-diameter/

 

I'm lookin at true dual 3in or if I put a y pipe in I'm wanting to go 4in

 

Oh ok. Well becareful with that. As you will read in the link and other articles you can rob yourself of power and torque by running to large a pipe. With exhaust you will find it's better to be a tad small then a tad big. You put to large a pipe on and she will fall on her face. I'm making right at 500rwhp and 650+ hp at the flywheel running 2.5" duals. I really need to up to 2.75" or 3". All things in due time.

 

Ok I guess in my head I'm figuring that if I'm runnin 2 3in pipes it would flow the same as one 6in pipe. I could be wrong and most likely am.

 

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Yes. Heres an example that will make it easy to picture. Make 6" circle on a sheet of paper. Now make 2 seperate 3" circles. Place them both in the 6" circle. Lots of room to spare. In fact a 6" pipe can flow as much as 4 individual 3" pipes.

Using the chart from the link you can really appreciate the flow differences when doubling a pipes size. A 1.5" pipe has a flow area of 1.48 or 171cfm's while a 3" pipe has a flow area of 6.49 or 747cfm's. Doubling the size of the pipe more than quadrupled the flow area and the cfm flow rate.

 

I got a MBRP exhaust, 4" is what it is, mandrel bent. I want to keep single exhaust, looking at your link looks like I get to do this!