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Old 06-10-2013, 05:49 PM
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Downpipe

I have straight piped my oem exhaust. I'm wanting to get a downpipe for my Truck. What should I go with a 4in, 3in, or 3.5 in downpipe? I was thinking of going with diamond eye.
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Old 06-10-2013, 06:11 PM
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Unless fitment is an issue on the early 99's there is no reason not to got with a 4"
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Old 06-10-2013, 06:12 PM
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3.5in or 3in?
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Old 06-10-2013, 06:19 PM
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Get a 4" down pipe. I have a e99 and that's what I run.

I have a full 4" straight pipe exhaust.

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Old 06-10-2013, 06:21 PM
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In my opinion. Straight piping a stock exhaust then putting a big down pipe on it is kinda worthless. Sure your opening it up at the turbo but as soon as you hit the stock exhaust its right back to the restrictive stock exhaust size.

Your truck your money. That's just my opinion.

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Old 06-10-2013, 06:26 PM
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Quote:
Originally Posted by Colin7.3 View Post
In my opinion. Straight piping a stock exhaust then putting a big down pipe on it is kinda worthless. Sure your opening it up at the turbo but as soon as you hit the stock exhaust its right back to the restrictive stock exhaust size.

Your truck your money. That's just my opinion.

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I agree, but replacing a stock down pipe with 3 or 3 1/2" is just as big a waste.
Waste of time and money because the improvement will be next to nothing
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Old 06-10-2013, 06:35 PM
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The factory dp is flattened from the factory so I was thinking that getting a new dp that is not flattened would open it up lower egts and maybe get a little better power.
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Old 06-11-2013, 02:53 AM
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It may help a little but then you've still got your restrictive stick exhaust pipe size. Think of it like this. You have a 3 lane highway. Well one lane is under construction. So the third lane has to merge into the other two. As we All know this causes the highway to slow down and back up. This is basically what's happening in your exhaust pipe. It may even end up hurting you cause of the restriction it could cause.

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Old 06-11-2013, 03:25 AM
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I would agree you may not see any power gains if anything I would do a whole 4" from the turbo back with a muffler delete then you will have better flow
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Old 06-11-2013, 01:08 PM
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the stock exhaust is 3.5 inch.
so if you can find a 3.5 downpipe you might be able to mate it to the stock exhaust fairly easy.

but a downpipe is 100 bucks. a whole kit is like 220-250.
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