For the longest time I thought OEM was the only way to get replacement exhaust manifolds but now it looks like Thorleys shorty headers are legal in CA? Provided you use the factory cat and O2 sensor locations. See below...
2005-2009 Toyota 4Runner / Lexus GX470 4.7L Short Tube Headers
https://ww2.arb.ca.gov/sites/default/files/aftermarket/devices/eo/d-540-7.pdf
Pretty steep price increase for them ($1050 for the pair) but still legit if true!
2005-2009 Toyota 4Runner / Lexus GX470 4.7L Short Tube Headers
https://ww2.arb.ca.gov/sites/default/files/aftermarket/devices/eo/d-540-7.pdf
Pretty steep price increase for them ($1050 for the pair) but still legit if true!
