Are you planning anytime on changing the headers or have you already done that? If you are planning on headers, maybe wait until you do that then get the tune done. Up to you though, just saves you some cash.
With just a CAI and cat-back exhaust you will see some benefits from the tune, but adding in the LT headers and some hi-flow cats will make an even bigger difference with a tune.
I had my car tuned last summer. I had a CAI and a ported TB on the car already, then had LT headers and the hi-flo cats put on. My base dyno run without a tune gave me 380hp/376lb/ft at the wheels. After the tune was done I have 418hp/408lb/ft at the wheels. I gained 38hp/32lb/ft with the tune. Pretty substantial numbers. Here is the dyno graph:
Oh and one more thing to note is that I have the NPP exhaust on my car too.
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2013 2SS Hot Wheels Edition 727 of 1524
w/ Dual Mode Performance Exhaust, Nav, and
Performance Shifter.
DELIVERED APRIL 22nd, 2013 and enjoying every minute since!
Mods:
Cold Air Inductions CAI, CNC Ported Throttle Body, Elite Engineering Oil Catch Can, Smoked Spyder LED Tail Lights, 12" JBL Sub, JBL Amp, Stealth Sub Box, American Racing LT headers and hi-flo cats, Tuned by Davenport, Custom painted interior pieces, Custom painted hood liner and trunk liner, Niche Targa M-130 wheels, LED side markers