gutted cat with muffler left on - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 09-22-2009, 11:33 AM Thread Starter
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gutted cat with muffler left on

has anyone done this? how does it sound? better to cut off muffler and put a piece of pipe in place? thinking of leaving muffler on since it is straight through design

97 ford f250 HD supercab xlt longbed
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kittyless and unmuffled
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post #2 of 11 Old 09-22-2009, 11:43 AM
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With a full exhaust, the 7.3's sound good completely straight piped. With the stacks I had to add a muffler to quiet it down in the cab a little bit.

'96 F350 CC dually 5 speed w/short throw shifter, '03 sd intercooler, stage 1 injectors, D66 turbo, 6 POS chip with Tony Wildman tunes, T500 HPOP, CCV mod, gutted EBPV, modded ID
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post #3 of 11 Old 09-22-2009, 02:06 PM
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Gutted my cat, deleted my muffler. Noticeable improvement on low end response.. Awesome turbo whistle when you open window as you are driving, especially in town as sound waves bounce back from store fronts. A little bit of a flutter noise at idle. Not any change at all inside cab as far as noise goes. People who drive with me have no idea that I am not running a muffler. Wife made no comment, has no idea what I did.. I had a muffler shop cut me a 3 inch dia. pipe about 24 inches long, and had them flare each end. Slipped it over existing gap where muffler was, and clamped down tight. Will weld it some other time. I am convinced it was worth the effort.

1997 F250 7.3L Krew Kab, Short box, Red&white
Banks Git-Kit, K&N Air Filter, Bypass oil filter,
Gutted Cat & muffler delete, 3 Pillar Isspro gauges: boost, pyro, trans. FPR shimmed, Marshall fuel pressure gauge under hood. 170K
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post #4 of 11 Old 09-22-2009, 02:10 PM
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Forgot to mention, I tried it out with just the gutted cat, and muffler intact. The result was no turbo whistle. Removing the muffler gave me the whistle sound I was craving.. Chris

1997 F250 7.3L Krew Kab, Short box, Red&white
Banks Git-Kit, K&N Air Filter, Bypass oil filter,
Gutted Cat & muffler delete, 3 Pillar Isspro gauges: boost, pyro, trans. FPR shimmed, Marshall fuel pressure gauge under hood. 170K
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post #5 of 11 Old 09-24-2009, 07:35 AM
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Originally Posted by otterdriver View Post
Gutted my cat, deleted my muffler. Noticeable improvement on low end response.. Awesome turbo whistle when you open window as you are driving, especially in town as sound waves bounce back from store fronts. A little bit of a flutter noise at idle. Not any change at all inside cab as far as noise goes. People who drive with me have no idea that I am not running a muffler. Wife made no comment, has no idea what I did.. I had a muffler shop cut me a 3 inch dia. pipe about 24 inches long, and had them flare each end. Slipped it over existing gap where muffler was, and clamped down tight. Will weld it some other time. I am convinced it was worth the effort.
thats whats im after. wifey doesnt need to know. and how did you clamp the pipe down? what kind of clamp did you use? im not up on the piping stuff.

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
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post #6 of 11 Old 09-24-2009, 07:46 AM
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I recommend saving yourself the trouble and just buy 4" turbo back. I was considering the options like you're doing now and am pleased with deciding to buy the 4" straight. Turbo is incredible. Cab noise is the same (in my opinion better). There is a slight drone towing 8k at 72ish or without towing it comes in about 82mph. If the turbo is what you're wanting to hear do that filter replacement mod everyone talks about also. Thats what I did but used a standard 10" long k&n with 4" outlet instead of the paper filter. If you're saving your pennies contact Farm Boys Diesel I think the name is. Cheap and effective
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post #7 of 11 Old 09-24-2009, 11:29 AM
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I just cut the cat and muffler of and it sounds good thats what I would do

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post #8 of 11 Old 09-24-2009, 01:57 PM
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Wrench's wisdom is sound, if you have the cash. I personally have practically zero cash with 4 kids to raise. This was a low buck deal, but the end result was not too bad at all!! I wish I could have a straight 4 inch system. I carefully measured the distance between the ends of the muffler, which came out to about 24 inches. My local muffler shop cut me a length, and flared out the ends to slip over the exhaust pipe. He sold me two clamps to fit over the flared ends. Total cost was about $28.00 . Any more questions please ask.

1997 F250 7.3L Krew Kab, Short box, Red&white
Banks Git-Kit, K&N Air Filter, Bypass oil filter,
Gutted Cat & muffler delete, 3 Pillar Isspro gauges: boost, pyro, trans. FPR shimmed, Marshall fuel pressure gauge under hood. 170K
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post #9 of 11 Old 09-24-2009, 02:02 PM
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Wrench's wisdom is sound, if you have the cash. I personally have practically zero cash with 4 kids to raise. This was a low buck deal, but the end result was not too bad at all!! I wish I could have a straight 4 inch system. I carefully measured the distance between the ends of the muffler, which came out to about 24 inches. My local muffler shop cut me a length, and flared out the ends to slip over the exhaust pipe. He sold me two clamps to fit over the flared ends. Total cost was about $28.00 . Any more questions please ask.
That is the way to go when you don't have alot of money cuz I don't have any either

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post #10 of 11 Old 09-25-2009, 08:18 AM
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I did it on the '97..picked up about 2-3 mpg and I now can pass someone in the hills..great free mod. I did at the same time install a Tymar.

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