Catalytic Keep It Or Get Rid Off It

CLEM PETRO · 04-08-2009, 06:40 PM

I finally installed my exhaust, MBRP single cat back. I was told i need to keep the catalytic converter. I,m not to impressed with it, its not loud enough i think the catalytic restricts the flow to much. So the question is do i really need it..................

__________________
07/3500 HEAVY DUTY QUAD CAB 4X4 SPORT 6" PROCOMP LONG ARM W/FOX SHOCKS FABTECH DIRT LOGIC STEERING STABILIZER, DICK CEPEK 20X9, PROCOMP 35 X 13.50 R20 EXTREME A/T, K&N COLD AIR INTAKE, BULLY DOG PROGRAMER, BUSHWACKER FENDER FLARES......

MBRP 4 in EXHAST..

Cummins287 · 04-08-2009, 06:41 PM

Check your local emmisions laws...

__________________
03 All Red Sport QCSB Auto,MBRP 4inTB, No Muff :, Ring MIA, Bullydog CAI, Autometer Phanthom II gauges, Smarty Pod...

***Walker*** · 04-08-2009, 08:21 PM

Our 02 doesn't have it, lost it somewhere LOL. It gets e-tested and they never say any thing about it. It does so well it gets 2 yrs without an e-test. That's a snap test not a visual smoke test.

__________________
03, 6 spd, 4x4, drw, CC, 373's:
Smarty/TNT, BD Super B Special, BD Flow-Max, GDP MK-2+BL, Arson, K&N CAI, 2nd-Gen Intake, 5" exhaust, RP, EGT and Boost gauges, recon smoked cab lights:
929tq @ 433hp before the Special

White Rat · 04-08-2009, 09:20 PM

I've been straight pipe for 3 years now, cops haven't even looked in my direction.

E-tests are a joke for our trucks, mine didn't even get started, I just talked with the guy about what's been done to it.

Pull it and store it.

__________________
95, Reg cab, NV45, 2wd, 3.5 LSD rear, Boost + pyro, 215's, Bhaf, Straight piped, 3k washers, AFC gutted, 100 plate, Boost control valve, the fast red interior and truely rust free!!

jp196400 · 06-08-2009, 12:54 PM

Im im the process of getting a 06 2500 and am looking to do the same thing,
I know what the visual smoke test but whats the snap test?

***hipsi*** · 06-08-2009, 05:14 PM

SAE says it best: Snap-Acceleration Smoke Test Procedure for Heavy-Duty Diesel Powered Vehicles

__________________
01.5 Flame Red 3500 DRW 2WD LB QC Laramie

47RE, 55 Block, BHAF, 4" Rapid Flow, DNA Muffler A.R.E Z Series Cap, Optima Blue Tops, AMSOIL, Anti Spin Diff, Line-X, Mopar Brush Guard, Silverstars, 235/75R/16 Dunlop Rover RVXT, Brembo Brakes, XZT+, RV275's, ISSPRO EV's Trans, Turbo, Fuel, J-Hook, BD Power Pod

youngcummins08 · 06-08-2009, 05:38 PM

so just floor it when in park?

__________________
my rig
96 2wd reg cab, 373k, K&N. Replacment airfilter, homemade 4in.

http://s338.photobucket.com/albums/n...n12350inhofer/

***Walker*** · 06-09-2009, 07:05 PM

Yep, the just rev the snot out of them LOL.

__________________
03, 6 spd, 4x4, drw, CC, 373's:
Smarty/TNT, BD Super B Special, BD Flow-Max, GDP MK-2+BL, Arson, K&N CAI, 2nd-Gen Intake, 5" exhaust, RP, EGT and Boost gauges, recon smoked cab lights:
929tq @ 433hp before the Special

Grassman · 06-09-2009, 10:27 PM

Thats the only way my truck smokes even with the Bully Dog PMT and hauling a big Skid Steer.

But I guess that's a good thing cuz smoke means un burnt fuel.

Getting back to the Snap test thou..

I see so many Transports, Dump Trucks and Cement trucks rolling coal how do they pass the test? If we were spewing that much we would fail for sure.

__________________
2007 5.9 4x4 Quad Cab Straight piped

jp196400 · 06-10-2009, 12:01 PM

Quote:

Originally Posted by Grassman

Thats the only way my truck smokes even with the Bully Dog PMT and hauling a big Skid Steer.

But I guess that's a good thing cuz smoke means un burnt fuel.

Getting back to the Snap test thou..

I see so many Transports, Dump Trucks and Cement trucks rolling coal how do they pass the test? If we were spewing that much we would fail for sure.

Thats a good question, I'd like to know that as well

Watchdog · 06-10-2009, 12:07 PM

Just gut the cat so it appears as you have one it will free up flow and act as a resonator.

__________________
2006 Ram 2500 Quad Cab Long Bed, 6 speed. 3.73. Diamond plate toolbox, DeeZee brite-tread running boards with running lights. CB radio, Xm Radio, Tone Ring Mod, Gutted air intake. Bypass Oil Filter by Frantz. Valair single Disk. Gutted Cat.

03CDNCummins · 06-17-2009, 09:29 PM

I've looked and then looked again. I cant find a cat on my truck?????? It's a US truck and it sounds stock, so what's up? I notice the exhaust system is held together by exhaust clamps, where most factory systems are welded on other vehicles. Is that normal with these trucks.

Also regarding the e-test (though I'm farm plate exempt) I understand that our medium duty diesels are only a visual inspection of the exhaust system anyways, so how would smoke make a difference? I had mine tested when I bought it just to see how it did. To my surprise, the test consisted of nothing but N/A's under every reading.

I know heavy duty diesels (tractor trailers) get the probe down the stack and I have had to do a roadside snap test before. It would be very hard to find a semi that won't roll coal under load. I think what they are looking for is if you smoke too much when the engine isn't pulling.

Therefore, ditch the catalytic.

__________________
Previous owner of a 2003 1/2 2500 4X4 crew cab long box HO automatic. Rolled and wrote off on July 5 2009.

Replaced with a 2005 3500 4X4 crew cab long box H.O. automatic dually.

04-08-2009, 06:40 PM	#1 (permalink)
CLEM PETRO Cummins Fan Join Date: Nov 2008 Location: Thornhill Ontario Canada Posts: 35 Thanks: 0 Thanked 0 Times in 0 Posts CLEM PETRO's Truck Pics	Catalytic Keep It Or Get Rid Off It I finally installed my exhaust, MBRP single cat back. I was told i need to keep the catalytic converter. I,m not to impressed with it, its not loud enough i think the catalytic restricts the flow to much. So the question is do i really need it.................. __________________ 07/3500 HEAVY DUTY QUAD CAB 4X4 SPORT 6" PROCOMP LONG ARM W/FOX SHOCKS FABTECH DIRT LOGIC STEERING STABILIZER, DICK CEPEK 20X9, PROCOMP 35 X 13.50 R20 EXTREME A/T, K&N COLD AIR INTAKE, BULLY DOG PROGRAMER, BUSHWACKER FENDER FLARES......MBRP 4 in EXHAST..

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Remove Advertisements Sponsored Links
Dodge Cummins Diesel Forum Advertisement

04-08-2009, 06:41 PM	#2 (permalink)
Cummins287 Cummins Enthusiast Join Date: Jan 2009 Location: Macungie Posts: 230 Thanks: 6 Thanked 0 Times in 0 Posts Cummins287's Truck Pics	Check your local emmisions laws... __________________ *03 All Red Sport QCSB Auto,MBRP 4inTB, No Muff :, Ring MIA, Bullydog CAI, Autometer Phanthom II gauges, Smarty Pod...*

04-08-2009, 08:21 PM	#3 (permalink)
*Walker* ....... Join Date: Apr 2007 Location: Ontario, Canada Posts: 918 Thanks: 28 Thanked 21 Times in 20 Posts Walker's Truck Pics	Our 02 doesn't have it, lost it somewhere LOL. It gets e-tested and they never say any thing about it. It does so well it gets 2 yrs without an e-test. That's a snap test not a visual smoke test. __________________ 03, 6 spd, 4x4, drw, CC, 373's: Smarty/TNT, BD Super B Special, BD Flow-Max, GDP MK-2+BL, Arson, K&N CAI, 2nd-Gen Intake, 5" exhaust, RP, EGT and Boost gauges, recon smoked cab lights: 929tq @ 433hp before the Special

04-08-2009, 09:20 PM	#4 (permalink)
White Rat O&A XM 202 Join Date: Jan 2006 Location: Little Britain, On, Canada Posts: 142 Thanks: 0 Thanked 0 Times in 0 Posts White Rat's Truck Pics	I've been straight pipe for 3 years now, cops haven't even looked in my direction. E-tests are a joke for our trucks, mine didn't even get started, I just talked with the guy about what's been done to it. Pull it and store it. __________________ 95, Reg cab, NV45, 2wd, 3.5 LSD rear, Boost + pyro, 215's, Bhaf, Straight piped, 3k washers, AFC gutted, 100 plate, Boost control valve, the fast red interior and truely rust free!!

06-08-2009, 12:54 PM	#5 (permalink)
jp196400 Cummins Fanatic Join Date: May 2009 Location: Toronto Posts: 183 Thanks: 0 Thanked 1 Time in 1 Post jp196400's Truck Pics	Im im the process of getting a 06 2500 and am looking to do the same thing, I know what the visual smoke test but whats the snap test?

06-08-2009, 05:14 PM	#6 (permalink)
*hipsi* BOMBS AWAY! Join Date: Apr 2008 Location: Toronto, ON Posts: 402 Thanks: 1 Thanked 0 Times in 0 Posts hipsi's Truck Pics	SAE says it best: Snap-Acceleration Smoke Test Procedure for Heavy-Duty Diesel Powered Vehicles __________________ 01.5 Flame Red 3500 DRW 2WD LB QC Laramie 47RE, 55 Block, BHAF, 4" Rapid Flow, DNA Muffler A.R.E Z Series Cap, Optima Blue Tops, AMSOIL, Anti Spin Diff, Line-X, Mopar Brush Guard, Silverstars, 235/75R/16 Dunlop Rover RVXT, Brembo Brakes, XZT+, RV275's, ISSPRO EV's Trans, Turbo, Fuel, J-Hook, BD Power Pod

06-08-2009, 05:38 PM	#7 (permalink)
youngcummins08 Diesel Head Join Date: Jun 2008 Location: terre haute, in Posts: 1,272 Thanks: 7 Thanked 17 Times in 16 Posts youngcummins08's Truck Pics	so just floor it when in park? __________________ my rig 96 2wd reg cab, 373k, K&N. Replacment airfilter, homemade 4in. http://s338.photobucket.com/albums/n...n12350inhofer/

06-09-2009, 07:05 PM	#8 (permalink)
*Walker* ....... Join Date: Apr 2007 Location: Ontario, Canada Posts: 918 Thanks: 28 Thanked 21 Times in 20 Posts Walker's Truck Pics	Yep, the just rev the snot out of them LOL. __________________ 03, 6 spd, 4x4, drw, CC, 373's: Smarty/TNT, BD Super B Special, BD Flow-Max, GDP MK-2+BL, Arson, K&N CAI, 2nd-Gen Intake, 5" exhaust, RP, EGT and Boost gauges, recon smoked cab lights: 929tq @ 433hp before the Special

06-09-2009, 10:27 PM	#9 (permalink)
Grassman Cummins Fanatic Join Date: Nov 2008 Posts: 134 Thanks: 0 Thanked 1 Time in 1 Post Grassman's Truck Pics	Thats the only way my truck smokes even with the Bully Dog PMT and hauling a big Skid Steer. But I guess that's a good thing cuz smoke means un burnt fuel. Getting back to the Snap test thou.. I see so many Transports, Dump Trucks and Cement trucks rolling coal how do they pass the test? If we were spewing that much we would fail for sure. __________________ 2007 5.9 4x4 Quad Cab Straight piped

06-10-2009, 12:07 PM	#11 (permalink)
Watchdog Cummins Nut Join Date: May 2006 Location: Northern Va. Posts: 309 Thanks: 0 Thanked 1 Time in 1 Post Watchdog's Truck Pics	Just gut the cat so it appears as you have one it will free up flow and act as a resonator. __________________ 2006 Ram 2500 Quad Cab Long Bed, 6 speed. 3.73. Diamond plate toolbox, DeeZee brite-tread running boards with running lights. CB radio, Xm Radio, Tone Ring Mod, Gutted air intake. Bypass Oil Filter by Frantz. Valair single Disk. Gutted Cat.

06-17-2009, 09:29 PM	#12 (permalink)
03CDNCummins Cummins Fanatic Join Date: Nov 2008 Location: SW Ontario Canada Posts: 120 Thanks: 3 Thanked 1 Time in 1 Post 03CDNCummins's Truck Pics	I've looked and then looked again. I cant find a cat on my truck?????? It's a US truck and it sounds stock, so what's up? I notice the exhaust system is held together by exhaust clamps, where most factory systems are welded on other vehicles. Is that normal with these trucks. Also regarding the e-test (though I'm farm plate exempt) I understand that our medium duty diesels are only a visual inspection of the exhaust system anyways, so how would smoke make a difference? I had mine tested when I bought it just to see how it did. To my surprise, the test consisted of nothing but N/A's under every reading. I know heavy duty diesels (tractor trailers) get the probe down the stack and I have had to do a roadside snap test before. It would be very hard to find a semi that won't roll coal under load. I think what they are looking for is if you smoke too much when the engine isn't pulling. Therefore, ditch the catalytic. __________________ Previous owner of a 2003 1/2 2500 4X4 crew cab long box HO automatic. Rolled and wrote off on July 5 2009. Replaced with a 2005 3500 4X4 crew cab long box H.O. automatic dually.