Great bolt-on upgrade
Sensor did what they claimed it would - improved low-end power. My HHR is 2.2 l & was very sluggish at low RPM, even considering it is a 5-speed. Car has noticeable improvement in accelleration, a big plus in traffic driving. RE: mileage improvement claim - marginal at best(ignore this part if you drive a Tahoe)Hwy is now 30.2 up from 29.9. Overall, is worth the cost & requires very little effort to install.
best 128.00 ive spent on hp
Have a hhr 2.4 lt and an air raid filter and box no other parts I like to do one thing see what I get and move to the next part .took a lot of slop out of the pedal added a nice crisp feeling to the throttle response .very easy install and instant results ! . A stock mass flow sensor cost about 75.00 dollars new and will not give you the added benefits of this reprogramed stock sensor.