I've heard that a CAI and a tune will give you noticeable increases in hp and tq resulting in better acceleration and throttle response. I've heard good things about the JLT cai...a guy up here by me has an 07 with a JLT and loves it.
I personally don't have an 05+ so I couldn't tell you exact hp numbers, but listening to others in the mustang community, a cai and tune is worth the money spent.
Those Cervinis 1/4 scoops look sweet. They have "Eleanor/old school gt500" all over them. I'd definitely get them.
...and yes that is how you spell dumbass
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.