Well that cost $220 when I got it done. If I were to get it redone, I would have gotten them to put the flex pipes on it before the hanger like they should have. Power gains, maybe very slight at the top end but there was a flat spot in the 2-2.5k rev range. Fuel economy is never affected directly, just indirectly when you want to hear a bit more noise. ECU was fine with it. But in saying that, my ecu was weird and is fine with pretty much everything even 6psi boost with supra injectors and bigger fuel pump when it should have been running so rich that it shouldn't even be able to idle.