4" or 5" Exhuast - Dodge Diesel

11-07-2003, 07:23 AM

I just got an 04 3500 and will be loading it up over time, to include HX40, Propane, Box, etc. I used to have a PSD and ran a 4" exhuast on that. Is there a negative side to having to big of an exhaust and is a 5" too big for what I plan to do with it. I just don't want to put a 4" on and then pull it off only to install a 5". Any comments would be appreciated.

Hoss · 11-07-2003, 09:36 AM

I've always heard that unless you're going over 500 HP then a 4" exhaust is all you need....or something like that. :-

Mark Craig · 11-07-2003, 09:40 AM

GDH11,

Checkout the last issue of the TDR, there was an article on when 5 inch is needed and soon. Basically they stated that when you get at the 500 RWHp level you would need the CFM capacity of 5 inch, below that it hurt the low end torque response of the the truck. Just an FYI. Call us if you have exhaust questions or visit our site.

Mark @ DPPI

Lil Dog · 11-07-2003, 12:57 PM

There is a good thread in the 2nd gen performance area about just this topic. Good information on how the size of the pipe affects performance...

Seems to me the 5" is a waste of dough...

http://www.dodge-diesel.org/yabbse/i...threadid=22079

J-eh

11-07-2003, 09:36 AM	#2
Hoss Thats MR Hoss to you buddy! Join Date: Jul 2001 Location: Central Texas Posts: 2,756 My Photo Gallery My Classified Ads	Re:4" or 5" Exhuast I've always heard that unless you're going over 500 HP then a 4" exhaust is all you need....or something like that. :- __________________ Stock: 2012 Laramie 2500 4x4, 6.7 CTD, 68RFE, CC, LB, SRW Mods: H&S XRT Pro w/Overdrive & EGR/Cooler Delete Kit - Flo~Pro Downpipe & DPF Delete Pipe - HBS 2.5" Leveling Kit & Anti-Sway Drop Bracket - Thuren Rear Lift Shackle - Air Lift Bags w/LoadController - Bilstein 5100's - Nitto Trail Grappler M/T 35x12.5x17 - Ranch Hand Front Bumper, Rack & Rails - Tough Country Rear Bumper - Rigid 30" E Series (Front) & 10" SR Series (Rear) Light Bars - Digital HID Conversions

11-07-2003, 09:40 AM	#3
Mark Craig Banned Join Date: May 2003 Location: Nashvile Tennessee Posts: 1,268 My Photo Gallery My Classified Ads	Re:4" or 5" Exhuast GDH11, Checkout the last issue of the TDR, there was an article on when 5 inch is needed and soon. Basically they stated that when you get at the 500 RWHp level you would need the CFM capacity of 5 inch, below that it hurt the low end torque response of the the truck. Just an FYI. Call us if you have exhaust questions or visit our site. Mark @ DPPI

11-07-2003, 12:57 PM	#4
Lil Dog Chapter President Join Date: Feb 2002 Location: Red Deer, Alberta Canada Posts: 6,075 My Photo Gallery My Classified Ads	Re:4" or 5" Exhuast There is a good thread in the 2nd gen performance area about just this topic. Good information on how the size of the pipe affects performance... Seems to me the 5" is a waste of dough... http://www.dodge-diesel.org/yabbse/i...threadid=22079 J-eh __________________ 97 2500 4X4 LWB CC SLT Laramie 5spd LSD 3.55. Isspro EV's pyro/boost, #10 Plate, PEAK 3K GSK, AFC Spring, DDP III inj, BD Super B Special Turbo, PEAK IC Boots, TAG III, South Bend 13-1.25" Con FE clutch, SCOTTY II-UNI, MBRP XP 4", KDP Tab, 16° Timing, SS DSS / 03TBK, Roda Deaco PAS. Espar D5WSC heater. B-Quiet sound deadening inside. Dyno 09-2009 405 RWHP / 1050 Ft-lbs '08 2500 4x4 MegaCab Laramie, 6.7L BlackTEC, 68RFE, 3.73 LSD, Smarty S67-ME, MDKRam air.

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