Exhaust Q & A - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 11-12-2009, 07:23 PM Thread Starter
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Exhaust Q & A

I want to customize the exhaust on my 99 7.3 without making it too loud. I have heard if you take out the cat & muffler & put in a high flow muffler only, its pretty loud. It has the stock system on it still w/ a chip & EGT only. I want to keep as much stock there for $$$ reasons, (+ its in really nice shape),& add a piece at a time here & there. Not do the whole 4" turbo back just yet. How much can I get a high flow muffler for (only) for the stock system for? Does Flowmaster offer anything for diesels? I love them on V8 gas motors, they sound great.
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post #2 of 9 (permalink) Old 11-12-2009, 07:54 PM
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How much can I get a high flow muffler for (only) for the stock system for?

A Walker BTM (part # 21470) should run you about a c-note plus whatever your muffler guy would charge for a little bit of cutting/welding to install it. I had one for a couple years until I went with a full 4" kit and was quite happy with it.

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post #3 of 9 (permalink) Old 11-12-2009, 08:41 PM
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A Walker BTM (part # 21470) should run you about a c-note plus whatever your muffler guy would charge for a little bit of cutting/welding to install it. I had one for a couple years until I went with a full 4" kit and was quite happy with it.
x2

however my 4" turbo back with a muffler isn't much louder than stock.

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post #4 of 9 (permalink) Old 11-12-2009, 08:56 PM
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x2

however my 4" turbo back with a muffler isn't much louder than stock.
Same here--the 4" sounds a little "throatier" and deeper than the sort-of stock exhaust system (cat ran off and a Walker BTM).

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post #5 of 9 (permalink) Old 11-13-2009, 12:41 AM
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Straight pipe it. It really isn't that loud, especially with stock piping.

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post #6 of 9 (permalink) Old 11-17-2009, 11:29 PM Thread Starter
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Straight pipe it. It really isn't that loud, especially with stock piping.
Does this hurt the turbo at all?? I thought it required back pressure to equalize itself. My thoughts are to cut before the cat & after the muffler & remove the entire section & put in a straight piece of pipe in its place. Would this be the way to do it??
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post #7 of 9 (permalink) Old 11-17-2009, 11:54 PM
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Quote:
Originally Posted by Numbnuts918 View Post
Does this hurt the turbo at all?? I thought it required back pressure to equalize itself. My thoughts are to cut before the cat & after the muffler & remove the entire section & put in a straight piece of pipe in its place. Would this be the way to do it??
No it doesn't hurt the turbo. I'd be willing to guess that 75% of the members on this site don't have a muffler... And yes, that'd be the way to do it.

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post #8 of 9 (permalink) Old 11-19-2009, 09:48 AM
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Quote:
Originally Posted by Numbnuts918 View Post
Does this hurt the turbo at all?? I thought it required back pressure to equalize itself. My thoughts are to cut before the cat & after the muffler & remove the entire section & put in a straight piece of pipe in its place. Would this be the way to do it??

10-4 good buddy get- r - done.....thats the way I have my truck.

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post #9 of 9 (permalink) Old 11-20-2009, 06:13 AM
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I thought it required back pressure to equalize itself.
False.

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