4RunnerAquasport
Senior Member
Thanks Todd! Love this community!!So I'll post my response that I just sent you so other people can see the difference in the TBs as well.
They are very similar, yes. But the 03/04 TB won't fit the plastic intake. I forget exactly why and of course didn't take a picture but there was some sort of interference or it was the bolt holes that didn't line up correctly.
First, this is how the 05+ TB would normally be installed. Unless you want to extend the TB wiring, it's simpler to just flip it upside down so your existing wiring harness will simply plug in.
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Here are pics of each, side by side, mounted on the respective intakes. The TB on the plastic intake has bee flipped already and is how it's installed on my 4Runner right now.
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There is also about a 12.5lb weight difference between the aluminum intake and the plastic, so the weight loss is a bonus with doing the swap.
You also need to get the fuel rails for the newer intake, or at least the front crossover pipe since the aluminum intake version goes under the TB and the plastic intake version goes over the intake. I tried fitting the alu intake version first and it wouldn't work. I think the fuel rails by themselves are the same but one side had different bolt hole locations. Best just to get the newer fuel rails and not have to fiddle with trying to make it work.
I highly advise replacing both fuel regulators on the fuel rails with new ones while you are doing the swap. Also a good time to check out the starter while you have access. Fuel injectors can be reused or you can spend the extra and replace them with 12 hole injectors like I did. I didn't see any performance or mpg gain with the new injectors tho.
I have a lot more pictures and details in my build thread on tacomaworld but feel free to hit my up with any other questions about doing the swap.
My daily driver 2003 4Runner Limited 4wd V8 | Page 2 | Tacoma World
I am wondering if the 12 hole Inj might be taken advantage of with my headers and a URD fuel pump. Thinking about swapping in an FJ 19 gallon tank to free up some travel on my drivers side upper link, and could put the new fuel pump in then. Also ordered a +3.5" DK LT kit, so I've gone completely out of my mind now. By the way my 1st gen is up for sale to help pay for all of this, so anyone in Florida.....
