2019-2025
2014-2018
2007-2013
1999-2006
Installation Time
(approx) 10 Minutes
Difficulty Level:
Simple installation for anyone.
Installation Guides
No guide available for this part yet.
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Flowmaster Delta Force Drop-In Replacement Air Filter (99-06 Sierra 1500)Find parts that fit my vehicle
Item S525086
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$100.35 each
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Product Information
Features, Description, Q&A, Specs & Installation
Features
- Increases Power, Throttle Response, and Efficiency
- Captures Microparticles More Efficiently than Factory Filters
- Multi-Layered, Pre-Oiled, and Woven Cotton Gauze Media
- Flat Factory-Style Air Filter
- Serviceable with Delta Force Refresh Kit
- Easy, Drop-In Installation
- Compatible with the Factory Air Box
- Includes 1 Air Filter
- Covered by Flowmaster’s 3-Year Limited Warranty
- Fits All 1999-2006 GMC Sierra 1500 Models
Description
Superior Air Filter. The Flowmaster Delta Force Drop-In Replacement Air Filter is an outstanding direct-replacement filter for your GMC Sierra 1500 truck. Its efficient design provides maximum filtration, giving your engine superb protection against dust and debris. And with its superb airflow, it helps draw more air that provides maximum cooling. This helps your truck perform with greater efficiency in most types of driving conditions.
Premium Woven Gauze Media. This Drop-In Replacement Air Filter is equipped with a multi-layered, pre-oiled, and woven cotton gauze media. It is specially engineered to capture microparticles more efficiently than most filters without sacrificing airflow.
Simple to Maintain. This Drop-In Replacement Air Filter is easy to maintain. It is serviceable with the Delta Force Performance Filter Refresh Kit (part number 615001). With proper maintenance and use under normal road conditions, this filter provides years of dependable performance.
Simple, Drop-In Installation. The direct-fit design of this Air Filter allows for fast and simple installation. Its convenient, drop-in feature lets you install it in no time without the need to modify your vehicle in any form.
Worry-Free 3-Year Limited Warranty. Flowmaster provides a warranty for this Delta Force Drop-In Replacement Air Filter against material or workmanship defects for 3 years from the original date of retail sale. Some conditions apply. To learn more, please refer to the manufacturer’s website.
Application. This Flowmaster Delta Force Drop-In Replacement Air Filter is designed for use on all 1999 to 2006 GMC Sierra 1500 models.
Flowmaster 615030
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) Drop-In Air Filter
4.8
Reviews of Flowmaster Intake Products (81)
Reviews of Flowmaster Intake products have an average rating of 4.8 out of 5
Mar 29, 2025
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (15-20 3.5L EcoBoost F-150, Excluding Raptor & 19-20 Limited)
2016 XLT -
Not bad
I bought because I wanted a turn down exhaust. For me it was to loud, made my truck sound like ricer. I took it off and went with a stock muffler and had the muffler shop put a turn down on that.
Mar 11, 2025
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (15-20 3.5L EcoBoost F-150, Excluding Raptor & 19-20 Limited)
2016 Lariat - TylerN06
Love it!
I love the way it sounds, and the axle exit is unique and just the tone that it brings out is amazing
Feb 17, 2025
Review shared from Flowmaster Outlaw Dual Exhaust System with Black Tips; Side/Rear Exit (21-25 5.0L F-150, Excluding Tremor)
2023 XLT - JoshJ885
Amazing Exhaust!
First time installing an exhasut system, was very straight forward install did it in my driveway. It sounds amazing and definitely makes it sound like the V8 it is. 10/10
Feb 7, 2025
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (15-20 2.7L EcoBoost F-150)
2017 XL - Armytrucker1985
Decent sound
I like that it's not obnoxiously loud. It don't quite rumble like a v8 exhaust but it hits the notes of the turbo really well
Jan 19, 2025
Review shared from Flowmaster Outlaw Dual Exhaust System with Black Tips; Side/Rear Exit (21-25 5.0L F-150, Excluding Tremor)
2021 Lariat - Jack0
2021 Ford F-150 Lariat 5L
Very easy install. Looks great and sounds amazing.
Jan 7, 2025
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (11-14 5.0L F-150)
2014 XLT - LittleMac
Sounds better than a dual exhaust.
Super easy to install, if you have a lift. Clean American muscle sound that might confuse your friends while laying down the rubber on the road. It sounds like a C5 Corvette but better. I know most gear heads choose dual exhaust, but this is worth buying and might change your mind before spending more for looks than muscle.
Jan 4, 2025
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (15-20 5.0L F-150)
2018 XLT - Ric77exhaust
Turndown exhaust
Great sound but does have some droning. Easy to install and remove stock exhaust not difficult.
Dec 19, 2024
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (11-14 5.0L F-150)
2014 FX4 - jazz7501
Stealth exhaust for your V8
I've removed the muffler after CAT and found some mis match with exhaust pressure. I found this product and ordered and installed. taking 30 min since I've already removed the mufflers. I love the starting sound also while riding. it is not super loud, no worries for your neighbor. Also no worries when offroading. But sometimes I can smell the exhaust when I stop for traffic signal.
Dec 7, 2024
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (15-20 5.0L F-150)
2018 XLT - Macedo3537
Vroom
Overall love this exhaust. Quieter than I expected but in a good way. Install was a breeze.
Dec 1, 2024
Review shared from Flowmaster FlowFX Extreme Single Exhaust System; Turn Down (15-20 5.0L F-150)
2020 XLT - JosefS
Solid exhaust! Heed warnings about volume
Awesome exhaust system for the price! Will reiterate as several others have mentioned, but it’s quite a bit louder in the cab than the video seems to portray. Depending on what you want, that may be great for you or it might not be ideal. Definitely loudest when you start the truck but quiets down once the RPMs drop. Isn’t too much noise to where you have to crank up your radio above a normal range, but you definitely hear what the V8 is supposed to sound like. The materials seem to be high quality but time will tell if it holds up. Would be good to mention that depending on your vehicle configuration (cabin and bed size), you may have to cut some of the pieces to make it work. For SuperCrew and 5.5’ bed, you only need the inlet and muffler pieces without any modifications. For the longer setups, you’ll have to use the supplied extension and may have to trim anywhere from 4-6” to make it fit. The instructions also mention that it’s ideal to throw a tack weld where the slip fittings meet up, but isn’t necessary (has been fine for me so far without doing that). Fairly straightforward to install even without a lift. If you have access to a lift, I’d use that before doing it on the ground. Throw some knocker loose or pb blaster to loosen up some of the hardware especially if you have some rust. Biggest pain was removing my slightly rust stock exhaust. Having extra space under the vehicle by using a lift would’ve been great, but if you remove the band clamp and pull apart the slip fitting that holds the 2 pieces together, you should be able to pull out the exhaust system without having to cut any of it in case you want to go back to it. Probably not the best recommendation, but I only put 2 jackstands on the passenger side frame to get the height needed to work under the vehicle and pull out the exhaust. Removing the spare tire and the spare tire guard give a couple extra inches to pull the exhaust system out of the rear most exhaust hanger and also gives space to finesse the rear portion of the exhaust system out from under the vehicle. The bolts that come with the system are just barely long enough to work so if you can find the same size bolts but just a 1/2”+ longer, it’ll make the job much easier. Took about 3 hrs from removing the stock exhaust to finishing up the install of the new exhaust system by myself, but would’ve been quicker if I’d known the nut and bolt sizes beforehand as well as taken off the spare tire and guard earlier.
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