[SoCoNoHa]

I'd like to weigh in on this, again. I have a piggy back I love, the AEM FIC6. Also a gear change is NOTHING compared to even 5 psi of properly managed boost.

Prior to using a piggyback on my Impreza, I had zero experience tuning. Still haven't used a stand alone, and they certainly give one more control and function, but at the cost of greatly increased price and complexity. I've seen name brand systems quoted at over ten times what my piggyback cost me.

The thing wired in pretty simply, and operating it is a breeze. Since it tweaks signals to and from the ECU, I get no trouble codes from sensors that aren't supposed to see positive manifold pressure. Fuel/timing/MAF signal/O2 signal/more can be altered based on throttle position/load/rpms/whatever. I can adjust maps on the fly, and witness the results within about 2 seconds.

In summation, it's a pretty good setup for up to 25psi (should be plenty for an EG) and it only ran me ~$350 on eBay. Good for up to 6 cylinders, too!

Anyone else got a piggy back or standalone?