4" vs 5".. is there really a difference. - Page 2

Varty Yo · 01-03-2013, 07:37 AM

get the 5"

**Capt.D** · 01-03-2013, 07:47 AM

Quote:

Originally Posted by skoley

To be honest I graduated college with a diesel degree and diesel do not need back pressure at all you can run them right out of the Turbo and you'll be fine all the exhaust is doing is getting the smoke out of there the bigger the exhaust the more.smoke it can move so the bigger the better and also you would have lower egts

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Man I hope my buddy doesn't see that post.....next thing you know he will have a turbo with a filter on the intake side and nothing but a turn up on the exhaust ,sticking out the top of his dodges hood......you know better breathing and all.....

skoley · 01-03-2013, 08:13 AM

Dude you wouldn't believe the dumb stuff I've seen Hood stacks are a common thing for dodges

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CaptainMorgan75 · 01-03-2013, 08:34 AM

Quote:

Originally Posted by Capt.D

Man I hope my buddy doesn't see that post.....next thing you know he will have a turbo with a filter on the intake side and nothing but a turn up on the exhaust ,sticking out the top of his dodges hood......you know better breathing and all.....

I have always wanted a hood stack! I could just never justify cutting my hood and then putting black smoke all over my baby. You have to admit though, it looks pretty cool at a sled pull or drag strip!

01Dmax · 01-03-2013, 08:38 AM

That mustang losing boost after opening up the exhaust is strictly because your system was too restrictive, post turbo. A loss in boost does NOT always mean a hp drop. Chances are very good that if you had that car on the dyno before and after, you would have seen that max boost came on quicker, and the car more than likely ran cooler as well. The same is true with our trucks. It doesnt matter how much air you try and cram in the intake, if it cant exhale tat the same rate you will see higher boost numbers and correspondingly high egts. On a turbo charged vehicle, large exhaust after the turbo will never hurt your performance.

CaptainMorgan75 · 01-03-2013, 08:46 AM

A cylinder head that does not flow enough on the intake side will also "show" more boost on a gauge that is placed in the intake. This is caused from a build up of boost in the intake. Lots of variables affect the boost gauge and more boost on the gauge does not always mean more power. Kind of rewording the previous post. I just wanted to second that the term "too big" (within reason) really doesn't apply to post turbo.

Cknight199 · 01-03-2013, 08:53 AM

Quote:

Originally Posted by CaptainMorgan75

A cylinder head that does not flow enough on the intake side will also "show" more boost on a gauge that is placed in the intake. This is caused from a build up of boost in the intake. Lots of variables affect the boost gauge and more boost on the gauge does not always mean more power. Kind of rewording the previous post. I just wanted to second that the term "too big" (within reason) really doesn't apply to post turbo.

X2, 10 psi on a 60mm inducer is less than 10 psi in a 72mm inducer because the 72mm has more volume to move the air.

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**jtyson8602** · 01-03-2013, 09:06 AM

Quote:

Originally Posted by 01Dmax

That mustang losing boost after opening up the exhaust is strictly because your system was too restrictive, post turbo. A loss in boost does NOT always mean a hp drop. Chances are very good that if you had that car on the dyno before and after, you would have seen that max boost came on quicker, and the car more than likely ran cooler as well. The same is true with our trucks. It doesnt matter how much air you try and cram in the intake, if it cant exhale tat the same rate you will see higher boost numbers and correspondingly high egts. On a turbo charged vehicle, large exhaust after the turbo will never hurt your performance.

While I can't confirm or deny what you say because I didn't dyno it, I can take a guess that wasn't the case. Ass dyno as my confirmation. That thing would burn them easily rolling all the way through 3rd gear. I couldn't get them to chirp in 2nd after the exhaust swap.

**jwcgmc1985** · 01-03-2013, 09:21 AM

23388248.jpg

**BLACKMAX1** · 01-03-2013, 11:41 AM

Dude get the 5in straight pipe, its not loud/annoying just driving around but when you get on it, it ROARS! and sounds F in awesome... heres mine 5in flo pro.

01-03-2013, 07:37 AM	eBay Motors #11 (permalink)
Varty Yo DuramaxForum Veteran Join Date: May 2011 Location: Regina, Sask! Posts: 1,339	get the 5" __________________ 2006 LBZ Mike L Stage Awesome! Airdog2 165, 5" MBRP Turbo back EFI Live tuned by Idaho Rob, DSP5, ATP Cognito set at 8" Nor-cal Truck SS idler support/ Rare parts tie rods 37x13.50x20" toyo MT's/ XD Hoss wheels, Fuel Octanes HID's All on mod/ AMP reaserch steps

01-03-2013, 08:38 AM	eBay Motors #15 (permalink)
01Dmax Senior Member Join Date: Dec 2007 Location: Spokane Valley WA Posts: 508	That mustang losing boost after opening up the exhaust is strictly because your system was too restrictive, post turbo. A loss in boost does NOT always mean a hp drop. Chances are very good that if you had that car on the dyno before and after, you would have seen that max boost came on quicker, and the car more than likely ran cooler as well. The same is true with our trucks. It doesnt matter how much air you try and cram in the intake, if it cant exhale tat the same rate you will see higher boost numbers and correspondingly high egts. On a turbo charged vehicle, large exhaust after the turbo will never hurt your performance. __________________ 2006 CC/SB LT3 2500HD 4x4 D/A 285-65 18 TOYO A/T's on Black Monster's, Cognito UCA, EFI Live DSP5 thanks to Rob, Alligator Stage V trans w/ML converter, ADII 165, Autometer Cobalt pyro and boost guages, Rare Parts HD tie rods, blocked and shimmed, 5" Magnaflow straight pipe 2001 CC/SB 2500HD 4x4 D/A - SOLD 1993 Z28 M6 Lloyd Elliot ported heads and intake, LE 1.6 cam, 1.6 RR, 52MM BBK TB, 30lb/hr injectors, PCMforless tune, K&N FIPK, Pacesetter longtubes, Pacesetter ORY, Magnaflow catback -the cat Dynaspark billet optispark, RAM kevlar clutch, 275-45-17 pirellis on 17x9.5 ZR1's up front, 315-35-17 on 17x11 ZR1 rears

01-03-2013, 08:46 AM	eBay Motors #16 (permalink)
CaptainMorgan75 Junior Member Join Date: Jul 2011 Posts: 26	A cylinder head that does not flow enough on the intake side will also "show" more boost on a gauge that is placed in the intake. This is caused from a build up of boost in the intake. Lots of variables affect the boost gauge and more boost on the gauge does not always mean more power. Kind of rewording the previous post. I just wanted to second that the term "too big" (within reason) really doesn't apply to post turbo. __________________ 2008 CCSB w/mild build Special thanks to Upstate Diesel Peformance & Alligator performance!

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01-03-2013, 08:13 AM	eBay Motors #13 (permalink)
skoley Junior Member Join Date: Jan 2013 Posts: 64	Dude you wouldn't believe the dumb stuff I've seen Hood stacks are a common thing for dodges Sent from my LG-P925

01-03-2013, 09:21 AM	eBay Motors #19 (permalink)
jwcgmc1985 what matters is our plan Join Date: Jan 2012 Location: Cypress Tx Posts: 5,675	23388248.jpg

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