We had an almost stock car visit our shop. I say almost stock because he had a K&N filter with less than 7k on it. All runs were done on the same day, same gas, same fan, and same Wrench Monkeys.
Here are the results. Please note all runs are best of 3 and sometimes 4.
Shiny, We have no fitment issues
Headers with RTX Section 1.
Headers vs Headers/RTX
We also swapped out an oem intake elbow for an an aftermarket version sold by many vendors, which was tested after the tuning and concluded zero gain and zero loss. However, it is fair to note that due to the build quality of such elbows it is more resistant to heat relative to the stock elbow.
Overall it was a great day. We were pleased with the stepped headers because it did as expected and provided great low end torque and the tune really made it a complete package by providing the top end power. It was great to see such a gain from the tune despite the opportunity of letting the car adapt to the changes.