I was wondering what the difference are between the 90-91 92-93 and 94 up headers? I know that they all will fit but will the 94 ^ exhaust line up and is it long enough? I was looking at some pics and the 92-93 seems longer, this is for the ls. What is the difference between the gsr’s and ls?
i’m pretty sure the 90-91 exhaust manifold is longer than the 92-93 ones. Because the 92-93 exhaust is longer than the 90-91 exhaust—and isn’t the overall length (full exhaust system) the same for all 90-93’s? Also the placement of the o2 sensor bung is different from 90-91 to 92-93.
i’m not sure about the 94+ exhaust manifolds. But the itr exhaust manifolds are basically the same length as the 92-93 manifolds. They just need to be altered by a muffler shop in order for them to physically bolt to your exhaust. And i’m not sure if the gsr, itr and ls 94+ exhaust manifolds have any differences.