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Old 12-15-2008, 04:36 PM
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Early 99 psd exhaust question

I have a 99 psd 7.3l diesel..I was wondering if there is any gain taking the muffler out and putting a straight pipe in?
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Old 12-15-2008, 04:40 PM
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Every little bit helps. The more air you can get out the cooler your egts will be. Run a 4 inch straight pipe all the way out.
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Old 12-15-2008, 04:46 PM
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ok will do Thank u
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Old 12-16-2008, 03:54 AM
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Yes removing the muffler is the best thing you can do for your truck. I would replace it with a Walker BTM muffler for $50, it is straight thru 3,5" which means no restriction. This and a better flowing intake will drop EGT's 100-150 degrees. Look at my mods, and my truck has never hit 1250 degrees!!

NCH
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Old 12-16-2008, 06:28 AM
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What they all said. I started off just running a straight pipe and eventually added a 3.5" DP to it along with a AIS. Dropped my EGTs about 100 degrees. After running that for a while, I replaced it with a 4" DP back system and got another 50 degree drop in EGTs.
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Old 12-16-2008, 07:27 AM
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I have no idea what my egt's were before I removed the muffler, but I have never hit over 1200, even after the DP tuner... turbo surge seems to hold me back before anything else.

I have the stock exhaust system, all I did was replace the section where the muffler was with 3.5" galv. (electrical emt pipe, as I'm an electrican and had it around) and haven't looked back... sounds better, not really loud, a friend of mine was surprised to hear that it had no type of muffler on it when I was talking to him the other day...

Some day I'd like to replace the whole thing with the complete 4" turbo back system, but sevral on here will tell you it's not really needed, untill you are pushing big HP...

I'm happy with mine!
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Old 12-16-2008, 05:34 PM
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Thanks guys.
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