encrypted03

Hopefully some O2 simulators might work. I had no cats in my altima, and the simulators worked great

2_FastTLs

1. Did ya read the description for "porting"? You cannot reshape the port when it's covered by that stupid cast-in exhaust manifold!
2. You'll "realize" more gains with just installing a header (if possible) compared to polishing the ports with that stupid cast-in manifold still there.
3. It needs to be sliced off, then fabricate a header plate.

No rocket science here folks, this mundane process of headers, porting, polishing, has been around for decades, and has not changed much.