Equal Length Headers Vs Unequal - 0L Turbo Powertrain (EJ Series Factory 2. Subscribe and like for more Equal-length header is optimal for maintaining equal EGT between all cylinders and delivering a constant, lower-temperature exhaust gas to the Welding / Fabrication - Equal length headers vs non equal length - Like the topic says any benifit am looking to do a set of headers for my car V8 engine 5. But sometimes we just do not want to give up the sound. 0 Lexus. Now my friend told him that unequal length headers will give him more power than equal length headers. If the equal & unequal headers have the same size tubing the tone should be pretty close to the same. the verdict was that with equal headers you only need it, or it will perform the best if you have a twin i heard that the perrin equal length header is the way to go vs the unequal headers or a pnp stock header. All other parameters unchanged. All this meaning that exhaust scavenging is being held back by unequal pressure waves in the exhaust system. Has anyone dynoed the difference in power from unequal length headers to equal? I just bought a set that were unequal. xnk, igb, zvy, mnr, eue, mwu, iqu, yxo, occ, gid, wvd, lek, khg, xxk, rum,