Does what it claims Does what it claims. Put Stage 1 on my 2007 Accord V6. Immediately noticed car running smoother, more responsive gas pedal...seems to react higher on the pedal too. After 48 hours, it's still improving. Transmission shifting more softly, can feel a smoother power band. Found two reviews by professionals online. Both came up with similar results. Worth the money.

Can't get ahold of them to return a… Can't get ahold of them to return a product Update: Got a call from their customer service department. I don't know why they didn't receive my email, but they really stepped up to the plate to resolve my unhappiness. They were really great to handle this situation after contacting me. PSA: The stage one tuning chip is the bomb!

Beware of Electrical Issues I am no expert but I did notice performance gain on my 08 Chevy HHR SS. The problem is the chip caused some electrical issues. When I first installed it some fuses were blown immediately. I replaced those thinking its just a one time issue. Used the chip for a few more weeks and then one day the ABS light came on. Took it to my mechanic and it turns out that the ABS module/system was gone. Now I cannot say its due to the JDM chip but I had never had electrical issues with the car before installing the JDM chip. So yes it does increase performance but beware of electrical issues at least if you own the HHR SS. No plans to use it anymore. Will go back to my Pedal Commander which has always worked well for me. Yes I know they are not the same but I am not trying to race anyone.

Stage 4 power chip Amazing product, easy to install, looks great on dashboard. Great company they are concerned about their clients.

Great Product, Great Service I bought a stage 2 chip, and though it was a significant power increase, it caused some surprise redline downshifts with my transmission when letting off the gas after full throttle. Contacted customer service who were very helpful. Replaced it with their JDM stage 3 chip and it is performing flawlessly. My Crown Victoria is now positively FEISTY!!!