4" or 5" Exhaust with X3 and Stock Head Bolts - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 25 (permalink) Old 09-20-2009, 02:51 AM Thread Starter
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4" or 5" Exhaust with X3 and Stock Head Bolts

Ok so I'm going to be running an SCT X3 with Extreme Race from Eric at Innovative with stock head bolts. And I'm looking at getting a 4" or 5" exhaust from MBRP. I have been told that you need to watch your EGTs when youre running stock head bolts. So will the 5" exhaust result in lower EGTs? Because I'm trying to be as safe as I can with these ttunes and stock head bolts! Will it help me at all? Any thoughts/ideas/comments are appreciated:)

Blake

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2008 F-250 CCSB King Ranch 6.4L
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post #2 of 25 (permalink) Old 09-20-2009, 02:57 AM
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

I am running 4 inch with stock bolts and erics x race it not too bad.

2003 F-350 Crew 4x4 205k 4" silverline turbo back CAI, Garret Stage One VGT, 165cc injectors, SCT ID's x-race x-street tow
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post #3 of 25 (permalink) Old 09-20-2009, 03:02 AM Thread Starter
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

What are your EGTs like?

Blake

Looking for a second 6.4L....

2008 F-250 CCSB King Ranch 6.4L
4" Rough Country Lift, Dual Steering Stabilizers, 20x10" XD Diesels, 35x12.50x20" Mickey Thompson MTZ's, Line-X, 15% Tint, MBRP 4" Cool Duals w/ 6" Tips, S&B Intake, Flo-Pro EGR Delete and Elbow, MBRP CAC Tube
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post #4 of 25 (permalink) Old 09-20-2009, 03:05 AM
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

Define 'not too bad', please.

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post #5 of 25 (permalink) Old 09-20-2009, 03:15 AM Thread Starter
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

Quote:
Originally Posted by dennisr_f350 View Post
Define 'not too bad', please.

Blake

Looking for a second 6.4L....

2008 F-250 CCSB King Ranch 6.4L
4" Rough Country Lift, Dual Steering Stabilizers, 20x10" XD Diesels, 35x12.50x20" Mickey Thompson MTZ's, Line-X, 15% Tint, MBRP 4" Cool Duals w/ 6" Tips, S&B Intake, Flo-Pro EGR Delete and Elbow, MBRP CAC Tube
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post #6 of 25 (permalink) Old 09-20-2009, 03:19 AM
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

just tell eric you are running stock head bolts..
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post #7 of 25 (permalink) Old 09-20-2009, 03:34 AM
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

over 1250 for an extended period of time would be bad such as towing. short periods like 1/4 mile or pulls it doesnt really matter but the key is not to keep itt there for more than a few seconds. mine gets up there fast with 190s and a stock turbo but unloaded highway driving it sits at 750 at 75 mph. I could get over 1600 with just an sct by Eric on a hard run.

2006 F250 CCSB

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post #8 of 25 (permalink) Old 09-20-2009, 12:41 PM
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

4" should be find, but talking with Eric will get you set up. I'm still waiting to get my SCT but there is a formula in an article in Diesel Power Magazine for figuring the right size you need.

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post #9 of 25 (permalink) Old 09-20-2009, 02:15 PM
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

4" is sufficient egt's aren't gonna drop anymore with a 5"

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post #10 of 25 (permalink) Old 09-20-2009, 02:37 PM
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Re: 4" or 5" Exhaust with X3 and Stock Head Bolts

4 inch is fine.

5 is just for looks and sound. There is NO performance gains/losses going from 4 to 5

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