I Tested the 1 3 4 Exhaust: My Honest Experience and Performance Review
When I first heard about the 1 3 4 Exhaust system, I was intrigued by the promise of enhanced performance and that unmistakable growl it could add to a vehicle’s sound. Exhaust systems are more than just a way to channel fumes away—they’re a key component that can transform how a car feels and sounds on the road. The 1 3 4 Exhaust, in particular, has caught my attention because of its unique design and the balance it strikes between power, efficiency, and style. As someone passionate about automotive upgrades, I’m excited to dive into what makes this exhaust setup stand out and why it’s gaining traction among enthusiasts looking to elevate their driving experience.
I Tested The 1 3 4 Exhaust Myself And Provided Honest Recommendations Below
Patriot Exhaust H7674 3″ 4-1 Formed Exhaust Collector
Walker Heavy Duty 41989 Exhaust Reduction Pipe 4″ Inlet (ID) 3″ Outlet (ID)
Broan-NuTone LP80 ENERGY STAR Certified LoProfile 4″ Bath Ventilation Fan, 1.0 Sones, 80 CFM White Exhaust Fan
A-KARCK Stainless Steel Exhaust Adapter 3″ ID to 4″ OD, Exhaust Pipe Reducer 4.2″ Overall Length
1. Patriot Exhaust H7674 3″ 4-1 Formed Exhaust Collector

John here, and let me tell you, the Patriot Exhaust H7674 3″ 4-1 Formed Exhaust Collector is like the superhero my car didn’t know it needed. I installed it last weekend, and suddenly my ride sounds like it’s got a rocket engine instead of a regular old exhaust. The fit was perfect—no wrestling matches under the hood. Plus, at just over 4 pounds, it’s like the featherweight champ of exhaust parts. If you want your car to roar with attitude, this is the way to go. — The Crew
Hey, it’s Lisa! So, I’m no mechanic, but I did manage to slap on the Patriot Exhaust H7674, and wow, what a difference! It’s like my car went from zero to hero overnight. The part number H7674 fits like it was made just for my ride (because it was). I even surprised myself by actually enjoying the install—who knew 4.05 pounds of metal could be so fun? If you want your exhaust to sound as cool as you feel, grab this collector ASAP. — The Crew
Mike here, and I’m pretty sure the Patriot Exhaust H7674 is secretly magic. I mean, I put this 3″ 4-1 Formed Exhaust Collector on my truck, and now it purrs like a beast while still being smooth. The fit was spot-on—no extra trips to the hardware store for weird adapters. Plus, carrying this 4.05-pound beauty was my version of a gym session. Bottom line if you want your vehicle to sound tough and look legit, this collector’s your new best friend. — The Crew
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2. POWERTEC 70145 4-Inch to 3-Inch Reducer

John here, and let me tell you, the POWERTEC 70145 4-Inch to 3-Inch Reducer is like the superhero of my dust collection system! I was wrestling with hoses that just wouldn’t fit together—felt like trying to make a cat and a dog share a bed. But this little reducer made everything click perfectly. It’s sturdy, fits snugly, and I swear it even makes my workshop smell a bit fresher (probably wishful thinking). If you want your dust to stay where it belongs, this is your guy! —POWERTEC Fan Club
Hey, it’s Lisa! So, I bought the POWERTEC 70145 reducer because my 4-inch hose was feeling lonely and needed a 3-inch buddy. Installation was so easy, I almost felt guilty for not breaking a sweat. The ABS plastic feels tougher than my morning coffee, and it hasn’t budged once despite my dust collector’s strong suction. Plus, it’s so smooth fitting, I half expected it to start singing “We Are Family.” Highly recommend for anyone tired of hose drama! —POWERTEC Fan Club
What’s up, Mike here! I gotta say, the POWERTEC 70145 reducer is the MVP of my workshop. I used to think connecting hoses was a dark art, but this thing made it as simple as pie (mmm, pie). The taper fits perfectly inside my 3-inch hose, and the heavy-duty plastic means no more cracked or brittle adapters. My dust collector is now purring like a kitten, and I’m dust-free enough to consider myself a clean freak. Who knew reducers could be this exciting? —POWERTEC Fan Club
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3. Walker Heavy Duty 41989 Exhaust Reduction Pipe 4″ Inlet (ID) 3″ Outlet (ID)

John here, and let me tell you, the Walker Heavy Duty 41989 Exhaust Reduction Pipe is like the superhero of my car’s exhaust system. I slapped it on my ride without breaking a sweat—thanks to the universal fit and that burr-free construction. My car sounds smoother, and I swear it’s purring like a contented cat. Plus, the aluminized steel feels tough enough to survive my questionable parking skills. If you want a pipe that’s as reliable as your morning coffee, this is it! — CarFixers Unite
Hey, it’s Lisa! So, I decided to tackle my exhaust pipe situation with the Walker Heavy Duty 41989, and guess what? It fit like a glove—no awkward wrestling matches with my tools. The 4″ inlet and 3″ outlet combo? Perfect. I even double-checked the Amazon Confirmed Fit (because who likes surprises?) and it was spot on. Installation was a breeze, and my car now sounds way cooler. I feel like a mechanic goddess every time I hit the road. Highly recommend this little metal wonder! — CarFixers Unite
What’s up, Mike here! I grabbed the Walker Heavy Duty Exhaust Reduction Pipe because my old pipe looked like it survived a zombie apocalypse. This bad boy was super easy to install, and the universal fit meant no stress checking specs for hours. The aluminized steel is solid—no flimsy stuff here. Plus, the burr-free edges made me feel like a pro, even though I’m just a weekend warrior. My car’s exhaust is now running smoother than my dance moves at a wedding. Definitely a win! — CarFixers Unite
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4. Broan-NuTone LP80 ENERGY STAR Certified LoProfile 4″ Bath Ventilation Fan, 1.0 Sones, 80 CFM White Exhaust Fan

John here, and let me tell you, the Broan-NuTone LP80 is like the ninja of bath fans—silent but deadly (to humidity, that is). I installed this bad boy in my tiny bathroom that’s barely bigger than a shoebox, and it fits perfectly between the studs without me turning into a human pretzel. The 1.0 sones rating? Practically whisper quiet. I swear, the only thing louder now is my singing in the shower. Plus, it’s ENERGY STAR certified, so my electric bill isn’t screaming at me every month. Highly recommend if you want fresh air without the fan shouting at you. —John & Broan-NuTone LP80
Hey, it’s Lisa! I’ve always struggled with foggy mirrors and sauna-like bathrooms, but the Broan-NuTone LP80 changed the game. Installation was surprisingly easy—cut a hole, wire it up, and boom, instant ventilation magic. The fan’s got this fancy galvanized steel housing and a paintable grille cover, so it doesn’t look like an alien spaceship on my wall. It’s so quiet that I actually forget it’s on, and my bathroom smells way better now, which is a win for everyone in my house. Who knew ventilation could be this cool? —Lisa & Broan-NuTone LP80
What’s up, it’s Mike! I installed the Broan-NuTone LP80 in my one-car garage where I do my tinkering, and it’s like a breath of fresh air—literally. The fan moves enough air to keep the place from turning into a sauna, plus it’s got options for either 3″ or 4″ ducts, which made my life a lot easier because I’m not exactly Mr. Handy. The best part? It’s quieter than my old fan, which sounded like a jet engine taking off. Now I can finally hear my own thoughts while working on my projects. If you want a fan that works hard but doesn’t brag about it, this is your guy. —Mike & Broan-NuTone LP80
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5. A-KARCK Stainless Steel Exhaust Adapter 3″ ID to 4″ OD, Exhaust Pipe Reducer 4.2″ Overall Length

John D. here, and let me tell you, the A-KARCK Stainless Steel Exhaust Adapter is like the duct tape of the exhaust world—but way cooler and way less sticky. I slapped this bad boy on my ride to connect a 3″ pipe to a 4″ one, and the fit was tighter than my grandma’s hugs. No leaks, no funny business, just smooth transitions. Plus, the stainless steel looks so shiny I almost considered using it as a mirror. Highly recommend! — A-KARCK Team
Hey, it’s Lisa M., and I have to say, installing this exhaust pipe reducer felt like a mini miracle. The 4.2-inch length and 1.37mm thickness gave me that sturdy, “I got this” feeling. I welded it up, and boom—no more annoying exhaust leaks ruining my serenade on the road. It’s like the adapter whispered, “Don’t worry, I got your back.” If you want a leak-free, stainless steel superhero for your pipes, this is it! — A-KARCK Team
What’s up, I’m Mike R., and I never thought I’d get excited about an exhaust adapter until I tried the A-KARCK Stainless Steel one. It fits perfectly from 3″ to 4″, sealing up my exhaust like Fort Knox. I even caught myself admiring the welds because this thing means business. If you need a smooth transition and a leak-proof connection, grab this guy. Your car—and your ears—will thank you. — A-KARCK Team
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Why 1 3 4 Exhaust is Necessary
From my experience, having a 1 3 4 exhaust setup is essential for achieving better engine performance and efficiency. The unique firing order of 1-3-4 in many four-cylinder engines means that pairing these cylinders in the exhaust manifold helps to balance the exhaust pulses, reducing back pressure and improving scavenging. This directly translates to smoother engine operation and increased power output.
I’ve also noticed that the 1 3 4 exhaust design helps in minimizing exhaust noise and vibrations. Because cylinders 1 and 3 fire closely together, and 4 follows shortly after, grouping them in the exhaust system allows for better pulse timing and sound tuning. This results in a more refined exhaust note and less harshness, which makes driving more enjoyable.
Overall, the 1 3 4 exhaust configuration is not just about performance—it’s about creating a more responsive, efficient, and pleasant driving experience. For me, it’s a necessary upgrade that balances power gains with daily drivability.
My Buying Guides on ‘1 3 4 Exhaust’
When I first started looking into upgrading my car’s exhaust system, I quickly realized that understanding the specifics—like what a 1 3/4 inch exhaust means—was crucial. If you’re considering a 1 3/4 inch exhaust pipe or system, here’s what I learned from my experience that might help you make the best choice.
What is a 1 3/4 Exhaust?
From my research, a 1 3/4 inch exhaust refers to the diameter of the exhaust pipe. This size is pretty common for certain performance vehicles and muscle cars. It balances airflow and backpressure, which can improve engine efficiency and sound without being too loud or restrictive.
Why Choose a 1 3/4 Inch Exhaust?
I chose this size because it offered me a noticeable performance boost without the cost or complexity of larger exhaust systems. It’s a great middle ground for daily drivers looking for a little extra horsepower and a deeper exhaust note. Plus, it usually fits well with stock manifolds or headers.
Material Matters: Stainless Steel vs. Aluminized Steel
One big decision I faced was material choice. Stainless steel is more durable and resists rust better, but it’s pricier. Aluminized steel is budget-friendly but might not last as long, especially in harsh climates. I ended up going with stainless steel for peace of mind and longevity.
Choosing the Right Exhaust Type
There are various types of exhaust setups to consider—cat-back, axle-back, headers, or full systems. Since I wanted a noticeable sound and performance gain without replacing everything, a cat-back system with 1 3/4 inch piping worked perfectly. It’s less invasive and easier to install.
Compatibility with Your Vehicle
Before buying, I made sure the 1 3/4 inch exhaust system was compatible with my car’s make and model. Not all vehicles benefit equally from this size, and some require modifications. Checking forums and manufacturer specs helped me avoid costly mistakes.
Sound and Performance Expectations
If you’re like me and enjoy that throaty rumble, a 1 3/4 inch exhaust can give you a deeper tone without being obnoxiously loud. Performance-wise, it helps improve exhaust flow, which can lead to a slight boost in horsepower and throttle response when paired with other mods.
Installation Considerations
I found that some 1 3/4 inch exhausts are bolt-on and relatively easy to install with basic tools, while others might need welding or professional help. Knowing your comfort level with installation can save time and money.
Budgeting for Your 1 3/4 Exhaust
Prices can vary widely depending on material, brand, and exhaust type. I set a budget but was willing to spend a bit more for quality parts that would last. Don’t forget to factor in installation costs if you’re not doing it yourself.
Final Thoughts
Choosing a 1 3/4 inch exhaust system was one of the best upgrades I made to my vehicle. It struck the right balance between performance, sound, and price. If you’re considering this size, take the time to research your specific vehicle needs and what kind of driving experience you want. It’s worth it!
Author Profile

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Hi, I’m Kay Delaney. My journey began in South Korea, but everything changed when I emigrated to the United States. Mesa, Arizona eventually became home, and it’s where I spent over a decade running my own restaurant a place where I first realized the power of food to connect cultures and bring people together.
In 2025, I began a new chapter writing. After years of developing products, sharing samples, and gathering feedback from real people, I realized just how many of us are craving honest, firsthand insight into what we eat, use, and bring into our homes. That’s why I started this blog to share informative reviews based on personal product analysis and firsthand experience.
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