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I wrote them down before I installed my header, but since I have lost the data.
All I remember is that the shortest runner was appx 18 inches and the longest 24. Roughly
Ok got the info on the Megan/Toyomoto/HP styled headers and surprise surprise, they are bigger than the rest. Thanks to IS3_FTW!!!
So a recap (will also update the first post):
That can explain a bit why the Megan type seem to hold power up top over at least the Mazzuri. However the difference between the Megan and the Xerd (0.14" or 3.6mm) is small enough to where I am not so sure the diameter difference matters all that much.
At this point, I am not so sure we necessarily need another Mazzuri to make the power of the Mazzuri full exhaust. That exhaust made 24rwhp and about 30rwtq. But that was a full 3" exhaust plus the very long runner header with a very good component, merged collectors!
The Xerd header plus Ypipe, coupled to the HKS exhaust made 17rwhp and over 20rwtq (dyno tested and reported in the DIY section on this site by Tony the site admin)
I think we can simply swap collectors on either the Megan or the Xerd and make nearly the same power as the Mazzuri most likely more. It seems the primary runners on the Mazzuri are not nearly as equal as we initially thought with as much as 7" difference between them
Originally Posted by MVP Motorsports 2JZGE Header!
Part # MVP Header SC
How does 17rwhp for less than $500 sound? That's exactly what the MVP Motorsports Exhaust Manifold gives you. For years people have been using the XERD Exhaust Manifold and while it's always been a great product, the service from XERD has been poor and has resulted in this item being very hard to get.
Not anymore! MVP has contacted XERD's manufacturer direct and is bringing it to you at the same price as before while keeping it in stock at all times for quick delivery.
When it comes to increasing horsepower on the Lexus, nothing comes close to offering the gains for the money spent as the MVP Exhaust Manifold does!
That's exactly what I ran back ....back ....back in the day.
SRT intake, HKS cam gear, Xerd header, oem Y & B, HKS Hi-Power. I can remember exactly what I dyno'd, the above numbers sound about right. I might have a dyno on my old computer, I'll check it out. Lol, heres an old youTube vid
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