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Medium Duty Trucks Discuss GM Kodiak/Topkicks, 4500/5500 & up medium duty engine & all associated components.

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Old 09-23-2018, 07:28 PM   #1 (permalink)
scocciante
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Exhaust

Interested in doing a 4" exhaust on a 2007 GMC topkick Eliminating the stock cat and Muffler .
Will the down pipe and front pipe from a Duramax Pu Fit
Can not find a listing for Topkick.

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2007 GMC Topkick C5500 Crew Cab Long Bed Dually LLY/LBZ Duramax
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4" Exhaust Cat Died.


Grand Design 344Gk 5TH Wheel
2018 Cooper S AWD Countryman

Last edited by OkDually; 09-23-2018 at 07:44 PM. Reason: prefix
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Old 09-24-2018, 05:28 AM   #2 (permalink)
ronjhall
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Look for Kodiak parts. Same truck except for badging.

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2004 C5500 Kodiak LLY. Gulf Stream Endura 25,000lbs with car, EGR Blocker & stick. PVC reroute. No programmer, Bilstien shocks, Ride Rite air Bags, Train horns, Filter minder, ISSPRO trans temp gauge, VDO EGT gauge, TST tire pressure monitor, Scangauge II, MBRP muffler, Modified turbo MP.
Avg mileage over 76k miles 10.3 mpg. Sold it 5/17.
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Old 09-25-2018, 09:17 PM   #3 (permalink)
07yellowkodiak
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Don't know if this helps but when I did my stacks I have to get different (longer) 90* pipe due to the frame being MUCH larger(taller) than little trucks. Keep that in mind when buying your kit
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Old 10-11-2018, 05:21 AM   #4 (permalink)
scocciante
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What i need to know is off the down pipe is the front pipe to the muffler the same as a PU say from the flange down to the center line of the pipe.It doesn't seem to exist in Topkick / Kodiak
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2007 GMC Topkick C5500 Crew Cab Long Bed Dually LLY/LBZ Duramax
Allison 6 Speed Upgrade PPE Level 2
Velvac Power Mirrors
Glowshift Turbo Boost, EGT & Trans Temp
Kenwood eXcelon DNX994S Compustar Remote Start
Hellwig Front Anti-Sway Bar Bilstiein Shocks
AirLift B&W 25K Companion
Tahoe LED DRL Projector Head Lights
4" Exhaust Cat Died.


Grand Design 344Gk 5TH Wheel
2018 Cooper S AWD Countryman
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Old 10-13-2018, 09:02 AM   #5 (permalink)
ronjhall
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Quote:
Originally Posted by scocciante View Post
What i need to know is off the down pipe is the front pipe to the muffler the same as a PU say from the flange down to the center line of the pipe.It doesn't seem to exist in Topkick / Kodiak


I have a stock c5500 down pipe. But with recent surgery cannot get up to barn loft to get info. My son will be here early next week. I will get you some info then.


Sent from my iPad using Tapatalk
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2004 C5500 Kodiak LLY. Gulf Stream Endura 25,000lbs with car, EGR Blocker & stick. PVC reroute. No programmer, Bilstien shocks, Ride Rite air Bags, Train horns, Filter minder, ISSPRO trans temp gauge, VDO EGT gauge, TST tire pressure monitor, Scangauge II, MBRP muffler, Modified turbo MP.
Avg mileage over 76k miles 10.3 mpg. Sold it 5/17.
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Old 10-16-2018, 12:28 PM   #6 (permalink)
ronjhall
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Here is a picture of the pipe I have.


It is a 3" ID pipe. Drop from flange end is 17" to center pipe.
Drop from stud end is 20" to center of pipe. These are approximate measurements.


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2004 C5500 Kodiak LLY. Gulf Stream Endura 25,000lbs with car, EGR Blocker & stick. PVC reroute. No programmer, Bilstien shocks, Ride Rite air Bags, Train horns, Filter minder, ISSPRO trans temp gauge, VDO EGT gauge, TST tire pressure monitor, Scangauge II, MBRP muffler, Modified turbo MP.
Avg mileage over 76k miles 10.3 mpg. Sold it 5/17.
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Old 10-16-2018, 07:07 PM   #7 (permalink)
scocciante
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This is basically what i have Verifying the PU cat delete pipe Is to short at 8" from the flange To Center Pipe. I guess I will have to build it flange Back setup unless somebody out there found a pipe I couldn't

Thanks For Your Time.
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2007 GMC Topkick C5500 Crew Cab Long Bed Dually LLY/LBZ Duramax
Allison 6 Speed Upgrade PPE Level 2
Velvac Power Mirrors
Glowshift Turbo Boost, EGT & Trans Temp
Kenwood eXcelon DNX994S Compustar Remote Start
Hellwig Front Anti-Sway Bar Bilstiein Shocks
AirLift B&W 25K Companion
Tahoe LED DRL Projector Head Lights
4" Exhaust Cat Died.


Grand Design 344Gk 5TH Wheel
2018 Cooper S AWD Countryman
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Old 10-24-2018, 07:58 PM   #8 (permalink)
scocciante
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Will any programing have to be done "I see no visible electronics or switches on the exhaust". Went from the Flange to up to 4"pipe back 30" to muffler than back to a 45 and out to a s/s Exhaust Elbow.
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2007 GMC Topkick C5500 Crew Cab Long Bed Dually LLY/LBZ Duramax
Allison 6 Speed Upgrade PPE Level 2
Velvac Power Mirrors
Glowshift Turbo Boost, EGT & Trans Temp
Kenwood eXcelon DNX994S Compustar Remote Start
Hellwig Front Anti-Sway Bar Bilstiein Shocks
AirLift B&W 25K Companion
Tahoe LED DRL Projector Head Lights
4" Exhaust Cat Died.


Grand Design 344Gk 5TH Wheel
2018 Cooper S AWD Countryman

Last edited by scocciante; 10-24-2018 at 08:01 PM.
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Old 10-25-2018, 05:39 AM   #9 (permalink)
ronjhall
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When I removed muffler and CAT no programing was required. MY exhaust stayed at 3 1/2"
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2004 C5500 Kodiak LLY. Gulf Stream Endura 25,000lbs with car, EGR Blocker & stick. PVC reroute. No programmer, Bilstien shocks, Ride Rite air Bags, Train horns, Filter minder, ISSPRO trans temp gauge, VDO EGT gauge, TST tire pressure monitor, Scangauge II, MBRP muffler, Modified turbo MP.
Avg mileage over 76k miles 10.3 mpg. Sold it 5/17.
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