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Old 08-27-2012   #26
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Join Date: Aug 2012
Location: SoCal
Posts: 20

Re: Headers for 5.0L / 5.7L TPI

Originally Posted by Fred91GTA View Post
No, they will not bolt up to the stock Y-pipe. You wouldn't want them to anyway. The stock Y-pipe is total garbage. Don does make his own Y-pipe for the headers and they are equally impressive. Huge pipes, mandrel bends and fit like a glove under the car. I have dual cats so I have the 2.5 inch Y-pipes going into 2 cats then into a Flowmaster Y-collector that turns into 3 inches all the way to the end.

The Y-pipe that 92rszz4 has in the pic is a Dyno Don Y-pipe. Look at how big those pipes are compared to stock.
That's correct if you are increasing the header size might as well increase the entire exhaust system if not you will continue with the same flow rate
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