I have both chips. I have dyno'ed both (including the dinan chip). All are good (even the dinan one surprisingly!). You won't get the advertised +18hp or whatever some sites advertise. You'll get more like a realistic 3-4hp. But the torque curve change is incredible!! The drivebility of the car increases 10fold!! I highly recommend a chip. Be it a dinan/GIAC/JC. A chip will help either way!!!