Quote:
Originally Posted by RarlyL8
Yes I am sure about that.
The "primaries" are those short tubes that connect the flanges to the rest of the system. Remove the heat exchangers and cut one of the tubes in half. Measure the ID not the OD. It's less than 1.5".
SSI's don't perform as well on the 3.2 because they are better matched in size to the SC. The HP bump for the stock Carrera vs the stock SC comes from 0.2L extra displacement and EFI.
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Just a follow up on this, had some 3.0 and 3.2 HEs side by side last week, and they are definately NOT the same size. The primary is larger on the 3.2.
By "Primary" I am talking about the pipe from the flange at the exhaust port to the collector where the 3 pipes merge in to one pipe, either just before the crossover pipe on the passenger side, or the cat on the drivers side.
The crossover pipe and cat are the same, but the HEs themselves are not.
At the port end, the ID was ~35mm vs ~38MM. I didn't have something that could accurately measure inside the collector, but I found the largest wrench that would fit in the port end of the 3.2 exchanger, and it would also fit in each of the 3 pipes on the collector end. In the 3.0 exchanger, it wouldn't fit in either end, in any of the three pipes.