I have a 2005 SRT6 in SSB color , bought it Sept 2014 with 56,200k , in Nov 2014 after driving just 200miles I had it Eurocharged (tampa installer) Stage 1 Software ,SC pulley along with Cooling package (new Johnson pump & Intercooler) and had the TCU (Transmission tune) , at that time I completely tuned it up (wires,plugs,all filters, hoses, belts,wires and even EC idler -tensioner pulleys) Car is now very scary Fast , 2nd & 3rd gear is a big Rush/Pull and usually run out of road ( Have to keep it safe and know when to slow down !!!) TCU tune made a big difference ,Shift points seem a little higher, My only complaint is after entire EC tune the Throttle response is almost too sensitive and touchy and at times if you should let off the gas when driving hard , It gets a bit bouncy , Driving normal around town ,No problem , Just seems If you are into the pedal and manually shifting the Auto-Stick and If I should let off the slightest bit , That is when it feels bouncy , Best I can describe it , Still a BLAST to drive