The stock "brown top" solenoids are fine for an NA Crossfire, the "blue top" type flow better but you'd also require the pressure control solenoid (PCS) maps in your TCU to be adjusted (ie you'd need a TCU tune). If you fit blue top solenoids and use your stock TCU then the shift pressures will be raised a heap and it will probably feel like the driveline will break as it changes down through the gears, especially 3 to 2 and 2 to 1. Leave the existing solenoids as they are.