Ive decided to go with magnaflow for sure. Im leaning twords the SI/SO 16612 system. For the simple reason of everybody having problems installing the 16614 duals. Im not as patient as most if I pay $500 for a system, id prefer for it to go on with no problems, the dual system seems like a pain in the rear to me. So my question is, will the single 3" gimme noticable power gain? Im sure it wont be as good as the dual setup but will it be THAT much difference? And will it sound as good as duals? On there website it has a sound clip of the single system, and I think it sounds sweet. Im looking to get one soon so any info/suggestions are appreciated. BTW this is for a 2006 screw 4x4 F150 5.4. Thanks alot.
Brian

 

From Magnaflow:
Q. Does a dual cat-back exhaust system perform better than a single?

A. In most cases a single exhaust will give you better torque and horsepower. The exception would be a heavily modified engine.

http://www.magnaflow.com/07techtips/faq/question14.asp

Also, hottexhaust.com has the 25% off coupon "fordtruck8". So, it should run you less than $400!

 

Thanks for Q and A from Magnaflow. I never did think about asking that on their site. Where do I put in the coupon code in at on hottexhaust?

 

In the shopping cart there is a small coupon link in white on the middle of the page, about 3" above "checkout". Clicking it opens a pop up to enter the coupon.