I'm went where you are. Once tuned, the tires would spin like crazy and I had to pay too much attention making turns at lights. So, i thought some new summer compound Kumho Ecstas on the back would help. Didn't help much. Then added a wavetrac...awesome!!! The car became balanced then. So my advice is... Don't do any more mods until/if you get the wavetrack. After doing that I added the tweaked manifolds, and a final tune fro Eurocharged. Couldn't be happier!!! Torque city.