xluben's 2011 WRX: Spec B 6 Speed and Rotated PTE 6266 by xluben

3 minute(s) of a 643 minute read

Sorry, forgot to update. I got tuned the other night, and the EL header did squeeze out some more power.



The real difference (as confirmed by the butt dyno) is the quicker spool and much better response. It is around 300rpm's sooner to 20psi (ie. at 3,600rpm's the EL header is at 20psi and the stock header was only at 13psi), and that is a noticeable difference on the street. The translates into a much broader powerband. The low/mid range torque is a hugedifference.  Between 3,200rpm's and 4,200rpm's it has 50 to 70 ft-lbs of torque more than the stock header!Past peak torque the difference is around 20 ft-lbs and that holds until redline.

Looking at the boost curve it is interesting to see that peak boost and boost all the way to redline was slightly lower than before, but the car is making more power! This is very similar to what TopSpeed saw with their testing. The tuning that was done to my car was to flatten the AFR's back out and added a very small amount of timing. Overall the car feels great with the new header. The end results is that the 50-100mph time is quicker using only 3rd gear than it is using 2nd and 3rd gear! The powerband is that wide!  

*Note: The baseline for this comparison was a recent log with the Greddy Ti-C exhaust and stock header. The numbers are slightly lower than what I have posted in my Greddy Ti-C review because I updated Virtual Dyno to use the correct 3rd gear ratio for my PAR gears (slightly shorter ratio, 1.31 vs 1.296), and this lowered the power figures slightly. The actual peak numbers are just numbers, but the shape of the curves and the differences between the two are what tell the story.

The 50-100mph time for a 3rd gear pull went from 4.6-4.7 seconds with the stock header, down to about 4.3 seconds with the EL header. This is due to the turbo spooling up sooner and being in a stronger part of the powerband by the time it reaches 50mph.

Invidia Equal Length Header (~4.3 seconds):

Stock Header (4.6-4.7 seconds):