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We're done under the car, so the exhaust system can be reinstalled to the back of the turbo's O2 housing. The stock nuts (and gasket) are reused, as is the entirety of the stock downpipe, as mentioned earlier. When attempting to fit the downpipe, we find that its inlet flange now sits about an inch down and rearward from stock (a fairly minor amount, considering an entire turbo system now sits in place of the stock exhaust manifold!). To compensate, a small amount is cut from one of the slip-fit connections in our GMPP cat-back. The exhaust then fit well, with the downpipe hanging just a bit lower under the car than before. View Related Article
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