I have nothing empircal to contribute to this discusison, though will merely say that I did
MS Stage II intake + MS pulley + ESS stage II tune + Akrapovic slip-on and the net effect was "wow the car is officially scary fast - any faster and I'd probably crash it."
The effects were certainly noticeable, and I love what they've done for the car's performance profile. The car has a whole new dimension to it torque-wise that as lacking previously. I suspect that the majority of the gains came from the tune, though I don't know for sure.
1. The car runs a bit hot in the summer time during routine driving. This occured post mods.
2. The intake requires intermittent maintenance - the various subjects come loose with time.
3. The idle appears to be a bit off - it will stall ~once a month on a cold start.
SSII | Speed cloth | Tint | LCI | 6MT | EDC | MS Stage 2 Intake | 240E + ESS Tune | MS Pulley | OEM GTS Wheels + Michelin Pilot S | MS Spacers | Akrapovic EVO (!) [+CF tips]