I got a 2005 mustang v6 and want to put k&n intake in any suggestions where I should get it from I kinda don't trust eBay , from what I heard they stamp the same tags on a bunch of intakes to make em look like they are legal but once u hit the smog check they screw u up!

 

american muscle.com

 

How bout some headers and maybe a chip?? Are there any ways I can increase the hp without ruining the warranty ?