Your money would be better spent doing a split port swap.

 

+1 A split-port swap would make you much more happy than a dual exhaust and CAI. You would gain 40-50hp with a split-port swap compared to the 10-15 you would gain with the dual exhaust and CAI. And the price would probably be around the same.

I would not advise going with straight pipes. Straight pipes sound like **** on our cars. Go with an H pipe over a straight pipe set-up.

 

https://mustangforums.com/m_3344642/...tm.htm#3344642

All is explained, and SSCs write up at the top of the page does a little more indepth annalysis on other things.