The chip was $400. It was one of the first thing I purchased for my S2. When I first put it in I did not notice a difference. I think it was the fact that expected more. After about six months I took the chip out to smog my car. At that point I discovered the chip did a whole lot. I notice the difference without the chip. My car felt very slugish without the chip. It also raised my redline by 500RPMs. Currently the chip is installed to help out with timing and the raised redline. The Huntley Racing MAF kit does the rest. One thing to think about is the cost. For the money I spent on my engine I could of purchased a 86 951.
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