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post #1 of 4 Old 03-23-2010, 11:54 AM Thread Starter
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Exhaust questions

I'll be replacing my factory DP with a 3" DP soon and figured while I was at it I'd go ahead and do a larger straight pipe dumping before the rear tire. I have factory piping now just with muffler and cat deletes. I hear I won't really gain much from larger straight pipe but I love the sound of a 5" exhaust at idle. Is there any gain to going with a 3"-5" coupling at the end of the DP and going 5" til the rear tire or should I just do 4" and get a 5" or 6" tip? Any thoughts? Thanks.

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post #2 of 4 Old 03-23-2010, 11:57 AM
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On the OBS, the DP upgrade is the only thing you will notice.

Even on the superduty, removing the muffler\cat and using the stock exhaust will be the same as getting a 4in or larger setup. The turbine outlet flange is under 3in anyways, so you aren't moving any more air that can come out of it.

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post #3 of 4 Old 03-23-2010, 11:59 AM Thread Starter
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Quote:
Originally Posted by Dirk View Post
On the OBS, the DP upgrade is the only thing you will notice.

Even on the superduty, removing the muffler\cat and using the stock exhaust will be the same as getting a 4in or larger setup. The turbine outlet flange is under 3in anyways, so you aren't moving any more air that can come out of it.
Right, like I mentioned I don't expect any performance from going larger straight pipe it's more just for looks and some sound. Would it be cheaper for me to go 3" DP to 4" straight pipe and the tip of my choice then?

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post #4 of 4 Old 03-23-2010, 12:13 PM
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It would be cheaper to use the stock pieces that you have and add a larger tip. I'm not sure how much "louder" moving to a 4in would be. I do know that having a full 5in setup will have an annoying droning sound in the cab.

Also, as far as the tip is concerned.. I didn't notice my exhaust being any different with or without the kit.

My setup:

Turbine outlet flange is 3.25in going to a full 4in Magnaflow SS without a muffler to the rear of the truck. I have a nice 5in MBRP 12 or 16in long tip.

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