Weird noise after S&B cold air intake install - Diesel Forum -
'99 & up Upgrades and Aftermarket - 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 3 (permalink) Old 04-05-2017, 08:43 AM Thread Starter
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Weird noise after S&B cold air intake install

So when I let off the go pedal, I get a cross between a cat hissing, and whoosh of air coming from the truck. It lasts for like a second.

I thought maybe I was hearing turbo noise that I couldn't hear before the 4" turbo back exhaust, but then I read it is air coming out of the larger aftermarket intake.

Can anybody confirm that?

It is really loud when shifting into OD/4 under load while pulling my toy hauler.

Sounds similar to this guy's video:

2001 F-350, 7.3L, Crew Cab, 4x4, Dually.
202,000 miles, and going strong.
4" Turbo Back MBPR Exhaust
S&B Cold Air Intake
DP-Tuner F5 Chip
6.0 Trans Cooler

It likes to pull a 44' 3" 2016 XLR Thunderbolt 420AMP Toy Hauler
ISSPRO 3 gauge (pyro, boost, trans) pillar install.
Located on Long Island, NY

Last edited by kench; 04-05-2017 at 10:35 AM. Reason: video
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post #2 of 3 (permalink) Old 04-05-2017, 12:52 PM
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It's normal. It's just air coming back out.
The stock box does it but it's enclosed so you don't hear it.
It's not the wastegate. The wastegate doesn't make noise.
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post #3 of 3 (permalink) Old 04-07-2017, 06:26 PM
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^ like blue said.

The only downside is you may want to floor it and let your foot off the pedal just so you can hear that noise 😂

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F350 2002 7.3

auto, 37/13.5/20 open country, Bushwaker cut-out flare, Bilstein 5100, Maxtow gauges (EGT, Trans temp, Boost), 4 inch diamond eye turbo back axel drop with BTM muffler, S&B intake, RR AIH plug, billet FPR with gold spring, CNCfab Sgt 1 HPOP, CNCfab HPOP line with cross over, CNCfab 4 line fuel kit, ARP heads stud, RDP plenum reinforcing insert, complete CAC intercooler boot kit, full engine seal and gasket kit, 360* turbo rebuilt, WWII, EGPV delete, dark blue CPS, Hydra chip with SDK tunes, Polished compressor manifold, HD coolant, 203* thermostat, Transgo HD kit, Energy suspension bushing kit, front and rear diff fully rebuilt with 4:88 gear ratio, Z36 powerstop heavy hauling brake kit, headlight relay mod, Fumoto drain valve AND STICKER

F350 2008 6.4 (sold)

TT 26' Springdale 2014
7x17 enclose trailer (shop) 2012
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