So for those of you looking into tunes, here is my firsthand experience with basically a mail order tune. My 2004 GTP (not a comp G) couldn’t pass emissions in my county because of the infamous P0420 code. Now, the cat still flows just fine, but it does have 172K miles on it if it’s original, which it appears to be. For the sake of full disclosure, I did order this tune with plans for light modifications later, one which I performed during the ecm swap. I ordered the tune with plans for a 3” catless DP and fenderwell intake. Very mild on both ends. Still stock exhaust from the DP back. Maybe a 50 shot at the track here and there. The main reason for spending the $125 was to get rid of the rear 02 DTC though, so keep that in mind. Using a BAFX OBD II Bluetooth adapter and the Torque app on an android tablet, I did a 0-60 run from the end of my driveway, uphill and came up with 8.73 seconds. Sounds bad, but keep in mind it was uphill (I live on the side of a mountain, and going the other way takes me to a stop sign, followed by the police station), and I wanted consistency. So with the coolant reading 170 on the nose with the original ecm, that was the result. Putting in the new ecm and fenderwell intake took about 40 minutes, taking my time. The car fired right up with no codes, no security system issues or anything. I let it get to 167 degrees in my driveway and staged on the road. I literally hit the throttle when the coolant temp gauge hit 170 on the nose. The resulting 0-60 time was 9.42. Almost 3/4 of a second slower. And the trans doesn’t shift quite as firm as before (and I thought it was soft before). Very, very, very disappointing. Now, I plan on putting some miles on the car and letting it “learn” and trying again, and I’ll post the results here. For now, at least for the money I’ll pass emissions and still be able to drive the car, but from a performance standpoint I’m absolutely floored the car could loose that much performance from a tune from a supposedly reputable company.
