I am driving an 04.5 Automatic G35 Coupe with the following performance mods:

High-Flow Cats
Borla Dual Exhaust
Plenum Spacer
Unorthodox Crank Pulley
Pop-Charger
Z-Tube
Grounding Wires

With all of these mods, my mileage is much worse than it used to be. It used to be around 21-22 and now it is 18-19.

Also, power does not seem to be equal throughout the shifting. It feels jerky at first, fine in the midrange, and the top-end takes a while to kick in.

I know my A/F ratio is way off and would like to fix it. So it is either an ECU flash like Technosquare or an air/fuel controller.

What do you guys think? Do I need the reflash and will I see some big differences? If you have the Technosquare, please give me your opinion.

Thanks.

Jason

 

i have a similar setup and would like to know everyone's thoughts as well..

2004.5 Coupe 5AT with Z-tube, Popcharger, Motordyne 3/8" Plenum Spacer, TopSpeed Pro1 headers, Crawford high flow cats, Fujitsubo Y-pipe, and Fujitsubo exhaust