Hey Olegd, I'm reading the stock headers have 4 cats. 2 in each header.. is this right? In 987.1 and 987.2 or? If this is the case, I can see why the aftermarket 200 cell headers can add going to just 1 200 cell in each header.The R exhaust catback and headers will fit Cayman Base. The reason Carnewal mod has very little impact on 987.2 cars is because of where the cats are located. Both are in the headers. In 987.1 one was in the muffler so removing it (as part of Carnewal mod) yielded power increase.
OK. so my initial conclusion was not wrong, for the 987.2 that is . Thanks for the clarification.In 987.1 and 987.2 there are 4 cats in total, 2 in each branch of the exhaust. The placement of the cats is different between .1 and .2. In 987.1 they put one cat in the header and one in the muffler. In 987.2 both cats are in the header.
That should really free up air flow compared to stock then.I can tell you for sure that Gert removes the two Porsche cats and installs a single 200-cell unit in each stock header.