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hexonracing are you NA or FI? In regards to these 2 upgrades it made my car alot faster! The higher stall builds boost quicker and the shifting launches the car itself. I have a turbo, so this made huge changes on my car. As far as your trans slipping, this is going to sound crazy but if the fluid is a quart low it can cause that. Not to mention some internal issues like the packs and such. When you say slip, what does the car do when you shift? Like I stated in some of my previous post, I am not a mechanic, but I don't just drop my car off to anyone. I have 2 mechanics, one for the engine and one for my transmission. I stayed under my car with my trans guy for hours and learned a ton of knowledge from him. When I went to pull the car out after installing the VB 2 weeks after the TC, the car revved all the way up 4100 rpm before it started to move. Pushed it back in and he knew exactly what was wrong. Just from swapping those 2 out and draining every bit of fluid possible from both of them to put back in, we ended up putting 3 quarts back into it. There is no way possible to get all the fluid out of the parts but we never imagined it would take 3 quarts.