If for some reason a header design needs to have unequal length primaries - ( longest tube 24" / shortest 18' ) ... Like has been mentioned long tube and equal length headers seem to make the most difference under the peak torque RPM. And I'll second the recommendation to play with collector lengths,. an equal length header over the stock header. The HP increase claims made by Micron were always specified as being tested with the muffler and headers together, so it is hard to tell how much each contributed to the overall gain. 2022 Subaru BRZ /Toyota GR86 and 2013-2021 Subaru BRZ /Scion FR-S/Toyota GR86 Equal Length Header by HKS The Stock exhaust manifold was designed by the 4-2-1 type layout for a better ... The stock unequal length header is what gives Subaru's their distint sound. Mar 28, 2009 · 1991 MUSTANG GT - BBK unequal length ceramic coated headers, BBK off road H-pipe, Flowmaster super 44 cat back, Ram hdx clutch, Energy Suspension polyurethane motor & trans mounts, MSD cap & rotor, MSD 8.5mm super conductor wires, MSD blaster coil, 180* thermostat, K&N air filter, removed air silencer. equal vs. unequal lenght headers.Jump to Latest Follow Status Not open for further replies. 1 - 9 of 9 Posts. steelers1377 · Registered. Joined Aug 18, 2008 · 691 Posts ... but i have heard the same thing. i have heard that equal length headers are harder to install,.. . 2022. 7. 20. · Borla Unequal Length Header|Rallysport Subaru WRX PERRIN Equal Length Headers IAG Performance Unequal Length Subaru Equal Length vs. Unequal Length 2001-2011 WRX/ WRX STI/ Legacy GT Borla IAG Equal Length Stainless Steel 3-Bolt Subaru WRX Agency Power Equal Length Equal Length vs Unequal Length Subaru PERRIN Equal Length Headers - Subaru Perrin. Dec 16, 2005 · with 4-1 Headers on V8, the unequal length Primaries. make OK HP and Torque ...but you can never achieve. the amount of Peak Torque the Engine should really make. you can come close by playing around with Collector Lengths, especially if you want to pickup Torque Curve under 5000 RPMs.. Apr 21, 2021 · The ultimate different between our header and any other design is the equal length. We could have made an unequal length one very quickly and got exactly the same numbers. Our collector is a true Merge like that on the Supersprint, pipe size is very similar. So, it's really not going to produce less power.. Equal lenght headers are tuned to a narrow rpm range. Something like 1000 rpm. Outside that range they will cost power over an unequal length set. Also, when looking at equal length headers, you can't just measure the lengths. Every bend adds length to the primaries. Mustang5 0patrol. My brother, who is in the Air Force in Afghanistan currently, got antsy and ordered some stuff for his nearly stock '88 GT 5-speed without doing any research. He ordered the BBK ceramic coated "EQUAL LENGTH" shorty headers in 1 5/8 from Latemodel Restoration Supply. They were about $350. Unequal length header will allow you to keep the Subaru Boxer rumble sound. Equal-length header is optimal for maintaining equal EGT between all cylinders and thus delivering a constant, lower-temperature exhaust gas to the turbo for their linear power gain. This affects the 2002-07 WRX and there are a few things that need to be modified in order to allow it to fit. Below is the info and part numbers needed to help guide you through the necessary steps to get the PERRIN Equal Length Header installed on your 02-07 WRX. For the 02-05 WRX (2.0L engine) the modification is simple.. Unequal length headers. Jump to Latest Follow. I don't believe anyone makes unequal length headers for a V6. It is an even firing engine however. "I'm not driving too fast...just flying too low" Mine: -03 SB Cobra vert- 2552 of 5082 Born 02/25/03 Our's: 90 7up vert - new project-07 DSG Focus -DD. If you are familiar with Subaru's famous EJ engine, you probably have heard of terms like Unequal Length Headers and Equal Length Headers. In this video, I'll be going over what headers are, what are the differences between equal length and unequal length headers along with a few sound clips. O2 Sensor Provision for both sensors. Modular with OEM Over Pipe back. Welded and Back Purged in house for strongest welds possible. Fully polished finish standard. Lifetime warranty to original owner. **NOTE**. If you opt for coating the wait time will be 4-5 business days after header completion.. Equal length vs. Unequal length headers . While this information is not specific to Subarus, we will explain the difference between equal length and unequal length exhaust manifolds using the Subaru example. When modifying WRX/STis, it is important to plan for the type of the aftermarket Subaru exhaust manifold (header) your will be getting.. GTSPEC, or Tomei Equal or Unequal length headers featuring the 3 bolt up-pipe flange. Features: Unequal length style. SS304 Stainless steel construction. 40mm piping diameter. 42mm turbine side ports. Aug 06, 2012 · A lot of the big subaru guys swap to an equal length setup for the power gains, just fyi. Anything pass 400+hp is normally equal .... Unequal vs. Equal length headers? Engine, Exhaust, Transmission. *SOLD*OFT Stage 2 UEL E85/Nameless Performance 3 inch axleback with 5 inch mufflers/ TRD CAI / CNT UEL/ Cusco Strut BAR & LHD Brake Stop / "JDM" Toyota Badges / WinJet JDM headlights - DRL MOD from fteightysix.com - 5000K Diode Dynamics HID kit / Diode Dynamics LED interior. If the equal & unequal headers have the same size tubing the tone should be pretty close to the same. However since the unequal headers have more tubing for the exhaust to travel through they may be just a tiny bit quieter. But not much since there is really not alot of extra tubing length. L. Also, when looking at equal length headers, you can't just measure the lengths. Every bend adds length to the primaries. Jul 11, 2017 · The Infinity Design Equal Length Long Tubular Headers truly are a work of art and a masterpiece. Finally, an aftermarket equal length long tubular header option is available for the E60 M5 market. Just by .... - Increase in mid-range hp and tq compared to 4-1 design while maintaining strong top end power- Modular design works with OEM and Aftermarket overpipes- 1.75″ Primaries / 2.00″ Secondaries / 2.50″ outlet- 15″ Convergent merge collectors for high velocity- 304 Stainless Steel tubing- Precision Tig Welded and back purged for maximum strength- Available with Cerakote thermal coating options. 2022 Subaru BRZ /Toyota GR86 and 2013-2021 Subaru BRZ /Scion FR-S/Toyota GR86 Equal Length Header by HKS The Stock exhaust manifold was designed by the 4-2-1 type layout for a better ... The stock unequal length header is what gives Subaru's their distint sound.. The equal length header is a much more efficient design for a couple of reasons, but it all stems from the exhaust runners being the same length. Sound Pressure Waveform Differences Between Equal Length and Unequal Length. What you are looking at is the sound pressure recorded at the end of. How UNequal length headers create tuning problems. How EQUAL Length headers eliminate tuning problems and also also finer engine tuning to further improve performance. Importance on the street as well as at the track. Adjustable headers: Idea (to adjust header tube lengths and thus "tune" headers to a specific rpm range) doesn't work well if .... If you’re stuck and not sure if you want equal or unequal length, check out this video put together by Subaru Enthusiast and youtube Vlogger Evan Shanks. The video compares the exhaust sound of running a Perrin Equal Length header vs. Agency Power’s Unequal Length Header. Click here for more info on the Agency Power Unequal Length Header.. 2022 Subaru BRZ /Toyota GR86 and 2013-2021 Subaru BRZ /Scion FR-S/Toyota GR86 Equal Length Header by HKS The Stock exhaust manifold was designed by the 4-2-1 type layout for a better ... The stock unequal length header is what gives Subaru's their distint sound. an equal length header over the stock header. The HP increase claims made by Micron were always specified as being tested with the muffler and headers together, so it is hard to tell how much each contributed to the overall gain. Our Unequal Length Header for the EJ-Series engines is very much the same. There are countless options out on the market for high-performing equal length header, but if you want to keep that classic Subaru rumble, there aren’t many great options. The OEM EJ header really hasn’t changed much in the past 20+ years and it shows. SO as the header reads equal length headers or unequal length headers. what are the benefits between the two. I know putting them on will gain some power but does one type add more trq than the other? 05-17-2013, 10:36 PM ... It's an old debate before subarus it was equal length vs. shorty headers. Should I go with equal or unequal length and what is the best set to buy? I was looking into getting EL headers as well but the UEL was looking appealing mainly because of the price, it's a little cheaper at least on the JDL website. Equal Length vs. Unequal Length Exhaust Manifolds Explained. If you've ever wondered about the pros and cons of equal length headers vs unequal length headers, check this out. ...flow cat and don't use ineffective 'fart can' mufflers...Equal vs slightly unequal length header primary tubes are not the biggest factor affecting sound quality. Al I know about equal length headers is the sound that you can get out of equal length SEQUENTIAL headers. 2022 Subaru BRZ /Toyota GR86 and 2013-2021 Subaru BRZ /Scion FR-S/Toyota GR86 Equal Length Header by HKS The Stock exhaust manifold was designed by the 4-2-1 type layout for a better ... The stock unequal length header is what gives Subaru's their distint sound. With shorty headers, you will require to choose between equal and unequal length headers where the unequal length headers will offer a deeper rumbling sound that will bother you or anyone at all. But in the case of the longer tubes, there won’t be a choice to make and therefore the longer tubes won’t make extremely loud noises which will .... 2022 Subaru BRZ /Toyota GR86 and 2013-2021 Subaru BRZ /Scion FR-S/Toyota GR86 Equal Length Header by HKS The Stock exhaust manifold was designed by the 4-2-1 type layout for a better ... The stock unequal length header is what gives Subaru's their distint sound.. an equal length header over the stock header. The HP increase claims made by Micron were always specified as being tested with the muffler and headers together, so it is hard to tell how much each contributed to the overall gain. For a few common header sizes, this is: 1 = 2.07. 1 = 2.19. 1 = 2.53. For example, for a 350ci engine with a peak torque goal of 5,000 rpm: PPA = (5,000 88,200) 43.75 ci. PPA = 2.48. To see what. Perrin Equal Length Headers - WRX 2002-2014 / STI 2004-2019 / More. Create a smooth sounding exhaust note while increasing horsepower and torque with the Perrin E4-Series equal. AFA "equal length". It's not like 90% of the "equal length" manifolds are qual length to begin with. Simply because the valves are never an equal distance from a center point & the majority of builders measure from the flange to the end. Not from the exhaust valve to the end. Afew inches here & there. It only shifts the rpm around alittle bit. May 01, 2015 · 1,137 Posts. #71 · Jul 19, 2009. Mechanically the difference is about as simple as it sounds. Equal length headers provide an equal distance for the exhaust to travel from the left and right banks to the midpipe, while the distance is uneven on an unequal length header. It is also true, as stated above, that the EL headers provide slightly .... Long runner equal length headers can reduce heat and therefore reduce low speed boost response. For street use it is hard to beat the effectiveness Equal length when measured from the valve (or valves) is nice because you know each cylinder is that much closer to making the same power, and. Mar 15, 2022 · With shorty headers, an additional choice you’ll need to make is whether to get unequal or equal length headers. 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