Toyota Exhaust Manifold Cracking - Important Updated Information
Over the summer of 2002, my wife and I purchased a 1998 2.7 liter, 5 speed, 4x4 4Runner to serve as our family mover and daily driver. Frankly, I was hoping to find a 3rd generation 4Runner 4x4 with the 5 speed/V6 combo, but 3rd generation manual transmission 4Runners of any type seemed to be in short supply in our area, so when I found a good deal on a four cylinder/4x4/5 speed model, I jumped on it. I'm glad I did, as it has proven to be a capable and reliable vehicle.
The four cylinder motor that Toyota used in both the 3rd generation 4Runners and Tacoma trucks is the DOHC 3RZ, which in stock form produces a max of 150 hp at the flywheel and 177 ft. lbs of torque, or about the same as the 3VZE V6 motors used in the second generation 4Runners and pre-Tacoma trucks. Given the weight of the 4Runner, this translates into acceptable performance, but even when coupled with the manual transmission and 4.56:1 gears, the stock performance can hardly be called exciting. Taking into account the increased weight of the 3rd generation 4Runners, I would say that the stock performance is probably comparable to that of the 22RE used in the first generation 4Runners: it isn't a total dog, but it won't set your heart racing, either.
The 3RZ is a great truck engine, but user feedback has confirmed one common problem: the stock cast exhaust manifold is prone to cracking, especially between the #2 and #3 exhaust runners.
IMPORTANT UPDATE (Apr 30, 2008)
To the end of the LC Engineering 3RZ header review (http://www.4x4wire.com/toyota/4Runner/reviews/lce_header/), add:
"Our part number for the 3RZ header has changed on that header. It is no longer PN 14-1731, it is now PN 1041054."
The corrected part number provided by:
To the end of the LC Engineering turbo header review (http://www.4x4wire.com/toyota/reviews/turboheader/), please add:
"In response to this review and other customer feedback, we have re-designed this header several times since this review was first published, and we have eliminated the problems that were present in the early designs, like the poor welds and the wastegate location/design.
The current design and build quality of this header are much improved over the initial release. If you could update your site with that information that would be great."
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