Aight, im new to this stuff. i just got a 2005 mustang GT about a month an a half ago. I need to know, about how much horse power and torque can i outta my 4.6 without haveing to go into the internals. my buddy was telling me to get some cam's and stuff, but like is there anythingelse. o and where can i find a side exhaust kit. well thanks to all who help me.

 

Externally you can do intake & exhaust, and a dyno tune

 

try ebay