Muffler delete-and cat? - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 02-10-2009, 06:08 PM Thread Starter
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Muffler delete-and cat?

I'm going to cut the muffler out of my stock 3.5" exhaust and straight pipe it this weekend, and I'm not sure if I want to do the same with the catalytic converter. I have a WVO set up, and I don't want to decrease emissions if I can help it. Does the cat really clean up the exhaust that much? Anybody know how it reacts when burning WVO? Will I notice much performance difference if I leave the cat or cut it out?

2000 F350 Crew Cab Short Bed,
AIS Intake/Zoodad, 203 thermostat, Billet Housing
Vegistroke WVO conversion, AIH Delete, Wicked Wheel, TurboMaster Wastegate controller
Pyro/Boost/Tranny Guages
4" Magnaflow Straight Pipe
DP-Tuner F6 80hp Econo, 80hp Tow, Decel, 100hp Performance, 120hp Race
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post #2 of 18 Old 02-10-2009, 06:10 PM
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You'll notice a diff with the cat out, emessions are pretty low, without it they would still be lower than most cars of that year.

Sr. Engineering Tech/OPS Technician @ Your local cable company.
1997 7.3L PSD
| 4" MBRP Exhaust | S&B CAI | Torque Converter Lock-Up Switch | Exhaust Brake | FPR Shim |DB High Torque Starter | 188,000 Miles | Xtreme Daily Tune | SOLD

2014 Ford Fusion SE
| 1.6 EcoBoost | 6-Speed Manual | The basics and some goodies |
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post #3 of 18 Old 02-10-2009, 06:18 PM Thread Starter
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How much noise difference is there with or without a cat with no muffler?

2000 F350 Crew Cab Short Bed,
AIS Intake/Zoodad, 203 thermostat, Billet Housing
Vegistroke WVO conversion, AIH Delete, Wicked Wheel, TurboMaster Wastegate controller
Pyro/Boost/Tranny Guages
4" Magnaflow Straight Pipe
DP-Tuner F6 80hp Econo, 80hp Tow, Decel, 100hp Performance, 120hp Race
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post #4 of 18 Old 02-10-2009, 06:19 PM
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At idle, not much. You can hear turbo whistle at idle, WOT its pretty damn loud!

Sr. Engineering Tech/OPS Technician @ Your local cable company.
1997 7.3L PSD
| 4" MBRP Exhaust | S&B CAI | Torque Converter Lock-Up Switch | Exhaust Brake | FPR Shim |DB High Torque Starter | 188,000 Miles | Xtreme Daily Tune | SOLD

2014 Ford Fusion SE
| 1.6 EcoBoost | 6-Speed Manual | The basics and some goodies |
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post #5 of 18 Old 02-10-2009, 06:32 PM Thread Starter
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Quote:
Originally Posted by 97StrokerG View Post
At idle, not much. You can hear turbo whistle at idle, WOT its pretty damn loud!
What's WOT?

2000 F350 Crew Cab Short Bed,
AIS Intake/Zoodad, 203 thermostat, Billet Housing
Vegistroke WVO conversion, AIH Delete, Wicked Wheel, TurboMaster Wastegate controller
Pyro/Boost/Tranny Guages
4" Magnaflow Straight Pipe
DP-Tuner F6 80hp Econo, 80hp Tow, Decel, 100hp Performance, 120hp Race
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post #6 of 18 Old 02-10-2009, 06:33 PM
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wide open throttle.

Sr. Engineering Tech/OPS Technician @ Your local cable company.
1997 7.3L PSD
| 4" MBRP Exhaust | S&B CAI | Torque Converter Lock-Up Switch | Exhaust Brake | FPR Shim |DB High Torque Starter | 188,000 Miles | Xtreme Daily Tune | SOLD

2014 Ford Fusion SE
| 1.6 EcoBoost | 6-Speed Manual | The basics and some goodies |
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post #7 of 18 Old 02-10-2009, 06:40 PM Thread Starter
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I noticed the intake and outlet of the muffler are at different heights-any suggestions on how to get a straight pipe in there?

2000 F350 Crew Cab Short Bed,
AIS Intake/Zoodad, 203 thermostat, Billet Housing
Vegistroke WVO conversion, AIH Delete, Wicked Wheel, TurboMaster Wastegate controller
Pyro/Boost/Tranny Guages
4" Magnaflow Straight Pipe
DP-Tuner F6 80hp Econo, 80hp Tow, Decel, 100hp Performance, 120hp Race
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post #8 of 18 Old 02-10-2009, 06:47 PM
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Buy a muffler delete kit, it comes pre bent.

Sr. Engineering Tech/OPS Technician @ Your local cable company.
1997 7.3L PSD
| 4" MBRP Exhaust | S&B CAI | Torque Converter Lock-Up Switch | Exhaust Brake | FPR Shim |DB High Torque Starter | 188,000 Miles | Xtreme Daily Tune | SOLD

2014 Ford Fusion SE
| 1.6 EcoBoost | 6-Speed Manual | The basics and some goodies |
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post #9 of 18 Old 02-10-2009, 07:54 PM Thread Starter
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Thanks-I'll let you know how it goes.

2000 F350 Crew Cab Short Bed,
AIS Intake/Zoodad, 203 thermostat, Billet Housing
Vegistroke WVO conversion, AIH Delete, Wicked Wheel, TurboMaster Wastegate controller
Pyro/Boost/Tranny Guages
4" Magnaflow Straight Pipe
DP-Tuner F6 80hp Econo, 80hp Tow, Decel, 100hp Performance, 120hp Race
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post #10 of 18 Old 02-11-2009, 04:34 AM
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Quote:
Originally Posted by BioStroker View Post
I noticed the intake and outlet of the muffler are at different heights-any suggestions on how to get a straight pipe in there?
When I did mine, I cut the stock pipe as close to the muffler as I could... mine had a bit of a dog-leg in it, and I wanted to keep that, I losened it at the splice in the pipe about a foot in front of the muffler, and rotated the dog-leged part 180 degrees so it was now giving me a raised part, not droped part, and from there, trimmed the ends of the stock pipe and the peice I was putting in place of the muffler to fit... hit it with the MIG welder, and a total of about 2 hours after I started, I had it done... I was able to "fit it" in place, tack it together with the welder, and then remove it to do the final weld job... it's a pain to get the tail pipe out over the rear-end (axle) and I think I had to remove the right rear shock and jack up the frame of the truck to gain some clearance between the frame and axle to get the tail pipe in and out...

Others will sugjest the use of flexible exhaust pipe, it will also work, I didn't do that for local inspection reasons, and the fact that I had every thing there in the garage... it was free for me, a few hours and beers later I was done.

Good luck, straight pipe is awesome, and delete the cat if you feel you can get away with it... check other recent threads on this BB about emmissions and the cat issues... long one a few days ago... Mine didn't have one, and there's nothing emmissions related here in WV anyway...

Greg

'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD

'00 F350 extcab, 9' utility bed, dually 221k

E'99 F250 extcab, S/Bed 211k

'00 Excursion Limited, 7.3PSD 281k

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