I have been gathering numbers from different sources, and it looks like the 1-3/4" cat-less ARH Direct Connect header system for the 2007 to 2009 5.7L would add 20 to 25 hp as a stand alone mod running the factory cat-back exhaust. Your thoughts.
Disappointed. I received my 2010S JBA shorty headers and examined them only to find burn marks on the exhaust ports. They were not smoothed for proper air flow and not even close to the proper shape of the exhaust ports on the heads. Waiting for response from seller on ebay.
I recently had a p0158 error code. I replaced all 4 o2/af sensors with Toyota sensors. After I have replaced them I have been noticing that my tailpipe has some white smoke or water vapor coming from it. Right now the weather is around 50 degrees in the high so I don't really know if it can be...