Review on Dorman 674-939 Exhaust Manifold: Perfect Fit for Selected Pontiac and Toyota Models by Ryan Huhn

So a lot of people are complaining about this exhaust manifold and I was a little hesitant to buy it but for this price compared to the factory I had to try it. and this is my experience. Before you start you'll need to remove the upper exhaust guard from the new manifold before you put it on the engine so you can get to the five bolts holding it to the head and then once you have everything in place, that oxygen sensor and the two spring bolts that go to the exhaust pipe you can reattach the heat shield as for the bracket below you simply use one of the holes on one end and hook the other end into the bracket that was on the start the engine and you're done. As for correctly tightening the nuts on the head, I was able to get to the one in the middle that everyone says is a ratchet and wrench problem, and yes, although I couldn't get an accurate torque wrench to get that exact tightness , which I'm dealing with, is long enough to know what two voltages are. So if you're thinking about getting this for your Pontiac vibe or Toyota Matrix and it fits your model go ahead, it's no big deal. install it. Or take it to your dealer and spend $500 :-)