4" vs 5".. is there really a difference. - Page 7

daword2011 · 01-07-2013, 10:22 PM

I think Chevy has the quietest and smoothest running engine out there. Hell my 01 has a quieter engine noise then some of the newer fords. I always love when ppl ask why diesels make noise under the hood, I always just say you can't expect 26,000 psi to be quiet haha

Sent from my iPhone using AutoGuide.com App

KentCountyCoal · 01-07-2013, 10:39 PM

I love my 5" MBRP straight pipe. Its all a matter of personal preference and money. Not gunna notice a huge difference. Im happy with my 5, but if u own an LLY theres not a lot of space between your spare and the rear shock... I just dropped mine.
Sounds awesome and looks even better billowing black smoke.

KC2GIW · 01-09-2013, 07:52 AM

Quote:

Originally Posted by CCPerformance.com

Well in that case I guess we should forget about 4" & 5" and move on to 7, 8 or 9" pipes........ Apparently bigger is always better...... Really?

How many 4" stacks have you seen on a pickup?

Bigger may not be better, but its also not worse.

It's all about image, baby...and sound. WRT to sound, there IS a difference. Love my 5"

(And so does yo mama)

boostnlb7 · 01-09-2013, 08:44 AM

Some more input, its common on almost every engine that the quicker u get air in and the quicker u can get rid of it, the better it will run.. I like to open my exhaust right up to its most free flowing potential, also lowers egt's, which we all want.. So IMO 5".. I dont like anything being restricted, as is the lb7 downpipe. Of a guy was going for sound, the that would be totally up to u... If a 5" sounded shitty but flows better than a 4, then ill take it

Cknight199 · 01-09-2013, 09:05 AM

Quote:

Originally Posted by boostnlb7

Some more input, its common on almost every engine that the quicker u get air in and the quicker u can get rid of it, the better it will run.. I like to open my exhaust right up to its most free flowing potential, also lowers egt's, which we all want.. So IMO 5".. I dont like anything being restricted, as is the lb7 downpipe. Of a guy was going for sound, the that would be totally up to u... If a 5" sounded shitty but flows better than a 4, then ill take it

What? There's no performance difference between 4" and 5". And 5" sounds better IMO, but it drones too bad in the cab. You will get better performance removing a cat off a 4" than replacing it with a 5". ImageUploadedByAutoguide1357751148.523829.jpg

Sent from my iPhone using AutoGuide.com App

Cmart1989 · 01-09-2013, 09:24 AM

Size is not going to matter with performance...

I have 4" DP back and I am not really satisfied with the noise level. A buddy of mine as the EXACT same set up to the T and his is twice as loud.

I will be moving up to a 4" in the very very near future.

Cknight199 · 01-09-2013, 09:49 AM

Quote:

Originally Posted by Cmart1989

Size is not going to matter with performance...

I have 4" DP back and I am not really satisfied with the noise level. A buddy of mine as the EXACT same set up to the T and his is twice as loud.

I will be moving up to a 4" in the very very near future.

Huh? Do you have the same truck as him? Your going to move from a 4" to a 4"?

Sent from my iPhone using AutoGuide.com App

Cmart1989 · 01-11-2013, 07:25 AM

Typo my bad...

I meant to say from a 4" to a 5"..

Yes 9 have a 06 lbz he has an 07 lbz classic... the exaust were bought from the exact same place.. part # everything...

The ONLY difference is the tip... I have a rolled tip and he has a mbrp tip... (straight edged i guess hard to explain)

The angle it comes out behind the tire is pretty much the same no huge difference..

I dont know exactly why.. I have looked on here numerous times trying to find an answer with no results... any ideas..

I apologize if I derailed the thread.. I can make a new one if it bothers anyone..

CKnight199.. any ideas??

Cknight199 · 01-11-2013, 07:34 AM

Quote:

Originally Posted by Cmart1989

Typo my bad...

I meant to say from a 4" to a 5"..

Yes 9 have a 06 lbz he has an 07 lbz classic... the exaust were bought from the exact same place.. part # everything...

The ONLY difference is the tip... I have a rolled tip and he has a mbrp tip... (straight edged i guess hard to explain)

The angle it comes out behind the tire is pretty much the same no huge difference..

I dont know exactly why.. I have looked on here numerous times trying to find an answer with no results... any ideas..

I apologize if I derailed the thread.. I can make a new one if it bothers anyone..

CKnight199.. any ideas??

It could be simple as tuning... Does your hiss at idle or is it a rumble?

smacker86 · 01-11-2013, 07:46 AM

..are you stock tuned still? what about him?

01-07-2013, 10:22 PM	eBay Motors #61 (permalink)
daword2011 DuramaxForum Veteran Join Date: Feb 2010 Location: College Station, Tx Posts: 1,086	I think Chevy has the quietest and smoothest running engine out there. Hell my 01 has a quieter engine noise then some of the newer fords. I always love when ppl ask why diesels make noise under the hood, I always just say you can't expect 26,000 psi to be quiet haha Sent from my iPhone using AutoGuide.com App __________________ -Austin- Fightin' Texas Aggie 2001 LB7 2500HD CC/SB 2WD 5" Flo~Pro Straight w/ 7" Tip\| ProFab Intake Horn \|Spectre Stage-2 CAI \| EFI Live w/ DSP-5 \| PPE Stage IV Transmission \| ProFab Downpipe \| PPE Boost Valve \| Holley Black Lift Pump \| Intake Heater Delete \| GlowShift Guages (Boost, Pyro, & Fuel Pressure) \| 3" Drop Shackles \| 18x9 Falken ORC 952's \| Nitto Terra Grapplers 285/65/r18 \| Kenwood Deck \| 2 12" Kenwood Subs on 2200watts \| 4 6-1/2" Pioneers (Doors) on 350watts \| JML 6000k HID Lo-Hi/Fog \| Herculiner Bedliner \| Westin Side Steps \| Ranch Hand Full Front and Rear Bumper Replacement. 546hp & 1025 ft/lbs at Lone Star Dyno, Spring Branch Tx.

01-07-2013, 10:39 PM	eBay Motors #62 (permalink)
KentCountyCoal Senior Member Join Date: Jan 2013 Location: Dover, DE Posts: 324	I love my 5" MBRP straight pipe. Its all a matter of personal preference and money. Not gunna notice a huge difference. Im happy with my 5, but if u own an LLY theres not a lot of space between your spare and the rear shock... I just dropped mine. Sounds awesome and looks even better billowing black smoke. __________________ 2005 ECSB LLY EFI Live 4094 AVNT Big Dipper 1058 Edge Insight CTS Air Dog II 165 GPH PCV, EGR, PPE Ported Blade Runner MP, 5" MBRP, AFE CAI

01-09-2013, 08:44 AM	eBay Motors #64 (permalink)
boostnlb7 DuramaxForum Veteran Join Date: Nov 2012 Location: in the woods of michigan Posts: 1,062	Some more input, its common on almost every engine that the quicker u get air in and the quicker u can get rid of it, the better it will run.. I like to open my exhaust right up to its most free flowing potential, also lowers egt's, which we all want.. So IMO 5".. I dont like anything being restricted, as is the lb7 downpipe. Of a guy was going for sound, the that would be totally up to u... If a 5" sounded shitty but flows better than a 4, then ill take it __________________ couldnt pass hazing to be a "pup bro" 03 lb7 ccsb 4x4-6" bds- 20"mkw's- p195/65/14 intercos- auto meter boost/pyro/trans gauges- traction bars- 5'' DE straight pipe- PPE BIV- AD II 200 lift pump- edge insight CTS- spectre CAI- 45% over injectors- LMM cp3 & FPR -EFI live dsp5 flashed by tony burkhard with danville tunes- thanks to Brent @ Lincoln Diesel

01-09-2013, 09:24 AM	eBay Motors #66 (permalink)
Cmart1989 Junior Member Join Date: Feb 2012 Location: Ankeny, IA Posts: 102	Size is not going to matter with performance... I have 4" DP back and I am not really satisfied with the noise level. A buddy of mine as the EXACT same set up to the T and his is twice as loud. I will be moving up to a 4" in the very very near future. __________________ 2006.5 CC/SB LBZ EFI Live DSP5 PCV Reroute & EGR Blocker Plate Edge Insight CTS w/ EGT Probe 4" MBRP Exhaust Turbo Back w/ 5" Rolled Tip Resonater Plug Transgo Jr. Pump Rub Fix High Beam All on Mod Tie Rod Sleeves More to Come....!!!

01-11-2013, 07:25 AM	eBay Motors #68 (permalink)
Cmart1989 Junior Member Join Date: Feb 2012 Location: Ankeny, IA Posts: 102	Typo my bad... I meant to say from a 4" to a 5".. Yes 9 have a 06 lbz he has an 07 lbz classic... the exaust were bought from the exact same place.. part # everything... The ONLY difference is the tip... I have a rolled tip and he has a mbrp tip... (straight edged i guess hard to explain) The angle it comes out behind the tire is pretty much the same no huge difference.. I dont know exactly why.. I have looked on here numerous times trying to find an answer with no results... any ideas.. I apologize if I derailed the thread.. I can make a new one if it bothers anyone.. CKnight199.. any ideas?? __________________ 2006.5 CC/SB LBZ EFI Live DSP5 PCV Reroute & EGR Blocker Plate Edge Insight CTS w/ EGT Probe 4" MBRP Exhaust Turbo Back w/ 5" Rolled Tip Resonater Plug Transgo Jr. Pump Rub Fix High Beam All on Mod Tie Rod Sleeves More to Come....!!!

01-11-2013, 07:46 AM	eBay Motors #70 (permalink)
smacker86 Junior Member Join Date: Dec 2010 Location: Forest City,MO Posts: 197	..are you stock tuned still? what about him? __________________ 2001 chevy 4x4 Regular Cab LB7...5inch exhaust(not MBRP!!) Profab intake horn and downpipe,Rare parts tie rods,Cognito Braces,Coolant filter,Nicktane,Airdog100,Pump rub fixed.diy high idle mod.Rear Airbags..................R.I.P.-2006 Chevy 2500 4x4.Regular Cab 4x4 LBZ

Remove Advertisements Sponsored Links
Duramax Forum Advertisement

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