Hi, I've recently put a Mugen exhaust on the car, but it's now running either lean or rich ( I think). Bought an old and got reading from torque.
I have a feeling I need to check the iacv, as I'm not sure the air reading are correct. I'm fairly new to mods, so if anyone can review and let me know if I should just go back to stock or have to look at ECU programming?