There is a ecu upgrade in production, I have one. It is the Jet Performance chip. It advances timing and I noticed a lot better low end than I had before. I have a 5sp but I read that it enhances the shifting on an automatic. Also as mentioned before get the AEM
pulley too. But if you have intentions of getting a I/H/E then do this first because at jet performance they ask you what you have done to your car so they can modify your ecu to give a proper air/fuel mixture. If you get the chip first and then decide to to the I/H/E then you might be S.O.L.