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6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 5 Old 09-24-2012, 08:10 PM Thread Starter Rookie
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Noob question sorry

So I'm about to do a few upgrades looking at the h&s xrt pro, S&B cai, sinister egr delete, and either a five inch turbo back or a 4 inch turbo back.. Question I have is I hear or read all these stories about how to get the stock dp out you have to cut it my question is if you have to cut the stock pipe to get it out how do you get the aftermarket one in. My second question is it really that much better to do a turbo back kit instead of a dp back kit and is 5 inch that much better than 4 inch. I'm also planning to get a kit with new charge pipes and intake elbow. Sorry for all the random questions I'm a converted cummins guy this v8 thing is all new to me

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post #2 of 5 Old 09-24-2012, 08:55 PM
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You dont have to cut any thing. i put 4in on mine turbo back and didnt cut any thing.
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post #3 of 5 Old 09-24-2012, 09:09 PM
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Some guys say they have to cut there's to get it out I'm not sure but the new down pipe comes in 2 pieces I believe which make thing very easy to install

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post #4 of 5 Old 09-24-2012, 09:09 PM
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To make getting stock dp out you can cut it before the cross member. This makes it much easier to remove. The aftermarkert dp should come in two pieces and you clamp them together. Hope this helps

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post #5 of 5 Old 09-25-2012, 03:35 AM
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To get the stock DP out you have to either cut it, lift the cab or remove the crossmember and shift the transmission to the drivers side a little. My suggestion is just cut it.

Yes down pipe will help over stock. The stock one is double walled and restrictive. Look at my build I have some pics of it. The aftermarket comes in 2 pieces.

Technically if you are not pushing over 600HP the 5 in will not help your performance. And all you NEED is a 4 in. But I have noticed that most people who start with the 4 eventually go with 5 because they think it sounds better.

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