This plenum was made by LP Performance. After I did the testing, they gave me the option of buying it at reduced cost instead of sending it back (because it was used). I was going to just put it on ebay, but decided that with some elbow mods it might really move some air. A 3" aluminum pipe was cut and welded in place of both the elbow and step in the back of the plenum. It now maintains a full 61mm at the TB opening and tapers to about 69mm which continues all the way into the main chamber.
Just my experience here, NOT a TB debate: I installed the 60MM throttle body and the throttle was so touchy I almost could not drive the car. If I simply touched the throttle with my foot it will be at 2000rpm instantly. The engine revs so fast to begin with, that the larger TB only made it a pain in the ass to drive. I could not maintain speed on the highway very easily, I was always unintentionally revving way too high on takeoffs, so I swapped back to a stock 52mm unit and it's fine now... I noted no difference in performance otherwise.
The plenum on the other hand, I did notice a small difference. It seems like power delivery below 4000rpm is enhanced, and the engine revs much more freely with very light load. This is kind of the reverse of what I expected, but I suppose that step in the back was doing more harm than good.


Just my experience here, NOT a TB debate: I installed the 60MM throttle body and the throttle was so touchy I almost could not drive the car. If I simply touched the throttle with my foot it will be at 2000rpm instantly. The engine revs so fast to begin with, that the larger TB only made it a pain in the ass to drive. I could not maintain speed on the highway very easily, I was always unintentionally revving way too high on takeoffs, so I swapped back to a stock 52mm unit and it's fine now... I noted no difference in performance otherwise.
The plenum on the other hand, I did notice a small difference. It seems like power delivery below 4000rpm is enhanced, and the engine revs much more freely with very light load. This is kind of the reverse of what I expected, but I suppose that step in the back was doing more harm than good.



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