Coilovers first!

 

None of the piggybacks give you anything drastic. I am running the BMS JB4 piggyback and all it gives me is a noticeable torque bump due to the turbo boost increase which is what all the piggybacks for our car do. It is night and day difference in the 0-60 torque feel though with a piggyback vs no piggyback. Car feels ultra slow without the piggyback. Again an ECU tune will give you much more for the money. To summarize, a piggyback just adds 1-3 extra PSI to the turbo and that’s it which is why you feel a torque difference in the 0-60 MPH range. An ECU tune almost everything is tweaked from transmission shift logic to turbo boost, etc. None of the current options are anything to write home about though because our factory turbo is too small. OV tuning is working on a bigger turbo setup for our car that should be a drastic difference that’s worth it.

 

For the IS there is no tune that really changes the car like APR/COBB/BM3 would to Audi and BMW. Enjoy your car for what it is.