I have been slowly buying parts to do some upgrades on the Caliber SRT-4 this spring. So far, I have only added the Mopar S1 ECU which helped a lot, especially with the throttle response. With the stock ECU, the throttle response left a lot to be desired thanks to the nanny drive-by-wire bullshit. As far as non-performance oriented upgrades, I have also added the Gizmos Retrofits 'lower splash shield' and their 'radiator cover', a shorty antenna from Modern Performance, and a 'SRT' grille badge from Mopar from the Challenger/Charger SRT vehicles (fits perfect, should have come stock on the Caliber SRT-4).
I have a big plastic tub full of parts waiting to go on this spring!
NeedsWings 3" O2 housing (eliminates 1st catalytic converter)
NeedsWings 3" down pipe w/cut-out provision (eliminates 2nd catalytic converter)
NeedsWings 3" intake (eliminates factory airbox)
NeedsWings BOV kit (HKS SSQV IV BOV with block off plate for factory surge valve)
Gizmos Retrofits single gauge A-pillar pod (plan to add wide-band gauge here)
Gizmos Retrofits dual gauge steering column pod (plan to add dual Aeroforce Interceptor gauges here)
Hawk HPS brake pads to replace front OEM pads
NAPA premium 'plain' rotors to replace front OEM rotors
Mopar 'RER' touch screen Nav radio to replace stock '08 'RES' non touch screen Nav radio (with '09 CSRT center stack bezel so it fits like stock)
Lockpick adapter to enable '09 Mopar RER Nav unit install and unlock lots of functions
That is what I have so far. I imagine this will be enough to bump the car up to around 320 WHP. I am also looking into getting the RealTune MS2K ECU to replace my Mopar MS1 ECU. Time will tell if/when that is ever released. The features (and supporting mods) are yet to be released. I am hoping that the addition of the RealTune MS2K ECU will get my car near somewhere between 350-400 WHP with the stock turbocharger. Who knows for sure.
This car has been a lot of fun so far though. It is WAY faster than my older turbo Mopars, although I admit I my older cars aren't much more than bolt-on stuff. I will say that I am adamant about doing the TIII swap on my Omni GLH Turbo and it WILL teach the CSRT who's boss in the end.
At any rate, I will post pics when Upgrade Day 2013 comes soon!