Originally Posted by TVT_DESIGN

Well finally we have an update.

The car we had the 300 kit on was having some serious tuning issues. First we thought it was due to the fuses being pulled to allow for a full dyno run, but that turned out not to be it. Then I thought there was a MAF problem and replaced that, still nothing.

Wednesday we spen 5 hours on the dyno and after seeing no changes as we kept dumping fuel we got puzzled. After a long search we found a piggyback (ebay junk) chip spliced into the stock ECU harness and tucked under the ECU. Found a name on the chip and called the company. Turns out it keeps the AFR at 14.7 and will allow 0 changes to timing, no matter what you do.

So the customer is having this removed on Monday, so we can follow up with some real results.

Such a huge waste of time. Never buy anything on ebay!