We have done a couple of these modifications before to other HR equipped 350Zs with great results. This round of upgrades differs in two areas. First off, this is the first set of headers that we have done on an HR car, and secondly, this car is an automatic.
The other changes we made to the car were the tried and true Injen intake system and a pair of Stillen high-flow catalytic converters, both of which we have installed on numerous cars that have come through the shop. Both of these parts have made nice gains in the past so we pretty much knew what to expect here.
Looking at the dyno graph you can see that the automatic transmission is certainly using up a little more power than in the manual cars but the power gains are more than noticeable. The car is now more powerful throughout the entire rev range and the torque curve in the middle is now gonna give that push in the back that we all love when you stab the throttle.
I have a feeling that we will be seeing this car again for another round of modifications. Now that we are an Up-Rev software retailer maybe we will get the chance to play with the fuel and timing tables to get the car where it needs to be. We can’t wait to get the chance.