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Old 11-11-2010, 08:29 PM
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3.5 Dp question

So my buddy came by today and gave me a complete magnaflow turbo back exhaust should I use the 3.5 downpipe with it or leave the stock one on it. I've heard you can loose pwr from a bigger dp.. Is that true?
Thx...Seth
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Old 11-12-2010, 04:26 AM
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Use the bigger downpipe, your truck will thank you.
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Old 11-12-2010, 06:24 AM
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Quote:
Originally Posted by the80proof View Post
So my buddy came by today and gave me a complete magnaflow turbo back exhaust should I use the 3.5 downpipe with it or leave the stock one on it. I've heard you can loose pwr from a bigger dp.. Is that true?
Thx...Seth
That is only if you go up to a 5", you will lose some low end.

3.5"DP to 4" I think is the best set up for the 6.0
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Old 11-12-2010, 02:53 PM
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The stock dp has a wedge type connector where the cat pipe requires a donut to mate to it. Then there is the pull clamp that pulls them together to make them seal.

The aftermarket dp are also going to be 3.5" till under the floor. They have to be as the turbo and clamp is designed for that size opening and the space available between firewall and engine has about that much room.

About the only issue you need to look into is the style of clamp you will have to mate the dp to the rest of the exhaust.

I just added a cat test pipe and had to install the mfrs dp to mate to it. The stock dp would have to be cut and the mating flange welded on to mate to the test pipe. I don't have the hardware to perform that in the driveway.
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Old 11-13-2010, 04:39 AM
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Some exhaust kits do have 4 inch down pipe (diamond eye)
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Old 11-13-2010, 07:44 PM
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Quote:
Originally Posted by the80proof View Post
So my buddy came by today and gave me a complete magnaflow turbo back exhaust should I use the 3.5 downpipe with it or leave the stock one on it. I've heard you can loose pwr from a bigger dp.. Is that true?
Thx...Seth
Hey Seth, are you on quattroworld as well? Your handle looks familiar.
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Old 11-14-2010, 05:07 PM
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Originally Posted by mike 6.0 View Post
Some exhaust kits do have 4 inch down pipe (diamond eye)
If there is such an application for a 4" dp, is the turbo stock?

The stock turbo has an outlet housing only so big and the clamp works with the outlet.
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Old 11-14-2010, 05:14 PM
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Originally Posted by jagular7 View Post
If there is such an application for a 4" dp, is the turbo stock?

The stock turbo has an outlet housing only so big and the clamp works with the outlet.
Although the outlet on the housing of the stock turbo is right around 3 inch I.D. , you can still benefit from running a larger downpipe with less restriction on a stock turbo. Hope that answers your question.
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Old 11-16-2010, 03:57 AM
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Afterthought

What's up man.. Yeah I'm on qw
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Old 11-16-2010, 05:48 AM
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I've got the 4 inch on mine, but be sure you either dent the downpipe or bend the lip back on the bottom of your firewall or you will have a nasty vibration and it sounds horrible.
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