Our Top 3 Picks
3 picks, 3 different buyers. Find the one whose description sounds like you and stop reading.
#1 – Spec-D Tuning Jdm 2.5″ Inlet Ss Catback
Best for: budget-conscious owners seeking a basic rear exhaust upgrade.
- Fits 05-10 Scion TC
- $132.54 (entry)
- 4.0 from 103 ratings
- Editorial score: 8.2/10
#2 – DNA Motoring CBE-SIM Catback Exhaust System
Best for: drivers seeking a balance of mandrel-bent construction and increased torque.
- 3″ OD muffler core diameter
- $158.02 (mid)
- 4.5 from 75 ratings
- Editorial score: 8.4/10
#3 – CORSA 14328 Cat-Back Exhaust System
Best for: owners prioritizing high-end manufacturing and noise cancellation technology.
- Reflective Sound Cancellation (RSC) Technology
- $293.99 (premium)
- 4.7 from 27 ratings
- Editorial score: 8/10
How ExtremeSpec Auto picked: we started from the 200 most-reviewed cat-back exhaust system listings in our retail dataset, removed duplicates, accessories and off-category products, and 139 qualified. The picks on this page were selected from those 139 candidates against this topic’s requirements. Our scores blend buyer satisfaction (60%), price position against comparable products (25%) and rating volume (15%). Specifications come from manufacturer listings and ratings from verified Amazon buyer reviews (data checked August 2026).
Our Pick and How the List Was Built
The Spec-D Tuning Jdm 2.5″ Inlet Ss Catback is the best Cat Back Exhaust System for scion tc because it provides a high-quality stainless steel build at a budget-friendly price point.
Choosing a rear exhaust upgrade often leads to “drone” issues or poor weld integrity that causes leaks under high heat. These failures can ruin the driving experience and necessitate expensive repairs.
The Spec-D Tuning Jdm 2.5″ Inlet Ss Catback solves these concerns by offering a durable stainless steel construction for the Scion TC. You should choose the DNA Motoring CBE-SIM if you want a 3″ OD muffler core for increased torque, or the CORSA 14328 if you require RSC technology for noise cancellation.
At ExtremeSpec Auto we evaluated the cat-back exhaust system options we track against this topic’s criteria. The selections here range from $132.54 to $293.99, while the median price of the 10 products in our comparison is $341.05.
If you own a truck, view our guide for the best cat back exhaust system for ford f-150.
What the data says
- Top pick: Spec-D Tuning Jdm 2.5″ Inlet Ss Catback at $132.54.
- Also picked: DNA Motoring CBE-SIM Catback Exhaust System at $158.02; CORSA 14328 Cat-Back Exhaust System at $293.99.
- We compared 10 Cat-back Exhaust Systems, from $132.54 to $1004.95, median $341.05.
- Best buyer rating in the comparison: CORSA 14328 Cat-Back Exhaust System at 4.7/5 from 27 ratings.
Full Comparison Table
| Product | Price | Rating |
|---|---|---|
| Spec-D Tuning Jdm 2.5″ Inlet Ss Catback | $132.54 | 4.0 (103 ratings) |
| DNA Motoring CBE-SIM Catback Exhaust System | $158.02 | 4.5 (75 ratings) |
| CORSA 14328 Cat-Back Exhaust System | $293.99 | 4.7 (27 ratings) |
| Flowmaster 817669 American Thunder Cat-back Exhaust System | $1004.95 | 4.2 (76 ratings) |
| Flowmaster 817726 Outlaw Cat-Back Exhaust Kit | $659.99 | 4.2 (75 ratings) |
| Flowmaster 817916 Outlaw Extreme Cat-Back Exhaust Kit | $341.05 | 4.5 (63 ratings) |
| Flowmaster 817479 American Thunder Cat-back Exhaust System | $338.88 | 4.7 (50 ratings) |
| BORLA 140416 Cat-Back Exhaust System | $599.95 | 4.4 (49 ratings) |
| Flowmaster 717910 FlowFX Cat-back Exhaust System | $539.99 | 4.5 (37 ratings) |
| Flowmaster 817709 American Thunder Cat-Back Exhaust Kit | $161.19 | 4.5 (36 ratings) |
Prices are approximate and move frequently – check the current price before deciding.
The DNA Motoring CBE-SIM Catback offers the strongest price-to-spec ratio because it provides a 3″ OD muffler core and T-304 stainless steel construction for around $158.02.
Our Picks Examined One by One
The 3 picks below run from $132.54 to $293.99, reviewed in rank order.
Spec-D Tuning Jdm 2.5″ Inlet Ss Catback
The Spec-D Tuning Jdm 2.5″ Inlet Ss Catback is included here as the primary budget-friendly option for the Scion TC. It provides a low entry point for owners who want a functional rear exhaust upgrade without a high initial investment.
What we like: This system offers a 30-day refund warranty and a 90-day defective item replacement warranty. It is priced at the $132.54 mark, making it the most accessible option in our comparison.
Keep in mind: The 2.5″ inlet is smaller than the 3″ muffler core found on mid-range systems. This may limit flow capacity compared to larger diameter alternatives.
Will this make my car sound like a race car or just a bit deeper? The technical specifications do not define a specific decibel level or note, so you should verify the sound profile with the manufacturer. Because it is an entry-level Jdm style, it typically focuses on a deeper tone rather than a high-pitched race note.
Is this loud enough to get a noise violation ticket? The data does not provide specific noise ratings or drone frequency limits. You must confirm the local noise ordinances for your area before purchasing to ensure the exhaust meets local requirements.
DNA Motoring CBE-SIM Catback Exhaust System
The DNA Motoring CBE-SIM Catback Exhaust System is our mid-range selection, chosen for its specific material construction and engineered flow characteristics for the Scion TC platform.
What we like: This system uses T-304 Stainless Steel and features a 3″ OD muffler core. It is engineered with computerized mandrel-bends and TIG welded CNC machine flanges to improve exhaust gas flow.
Keep in mind: This system deletes the resonator and muffler, which may result in a more aggressive sound than some owners prefer for a daily driver.
Will this make my car sound like a race car or just a bit deeper? The manufacturer describes the sound as an aggressive deep and smooth tone. The removal of the resonator suggests a more prominent exhaust note than a standard factory setup.
Is this loud enough to get a noise violation ticket? The specifications do not list a decibel rating. You should check the specific drone frequency at highway speeds, as the resonator deletion can sometimes lead to cabin resonance.
CORSA 14328 Cat-Back Exhaust System
The CORSA 14328 Cat-Back Exhaust System is the premium selection on this list, chosen for its high user rating and specialized sound cancellation technology.
What we like: This system features Patented No Drone, Reflective Sound Cancellation (RSC) Technology. It is constructed from 304 Stainless Steel and carries a high 4.7 rating from 27 buyers.
Keep in mind: At the $293.99 price point, this is the most expensive option on the list, which may rule out buyers seeking a budget-friendly upgrade.
Will this make my car sound like a race car or just a bit deeper? The system is designed to produce a custom-tuned, aggressive exhaust note while utilizing RSC technology to minimize drone. This typically results in a deeper, more refined sound rather than a raw race car tone.
Is this loud enough to get a noise violation ticket? While the RSC technology is designed to manage resonance, the data does not provide a specific decibel limit. You should confirm the system’s output meets your local area’s noise regulations.
How to Choose a Cat-back Exhaust System
Inlet Diameter Compatibility
Inlet diameter compatibility requires a precise match to your vehicle’s exhaust port to ensure a leak-free seal. You should confirm your Scion TC’s port size before ordering, as most cat-back systems require a specific adapter or matching pipe. The DNA Motoring CBE-SIM features a 2.25″ OD inlet, while the Spec-D Tuning Jdm 2.5″ Inlet Ss Catback provides a larger 2.5″ opening. If your port is smaller than the inlet, you must verify if the manufacturer includes a reducer, as missing hardware can lead to additional shipping costs for adapters. While a generic brand might offer a smaller diameter for a lower price, the 304 stainless steel systems selected here provide the durability needed to withstand heat cycling without warping.
Resonance Frequency
Resonance frequency determines whether your exhaust produces a pleasing note or a cabin-rattling drone at highway speeds. A well-tuned muffler, like the one in the CORSA 14328, uses Reflective Sound Cancellation (RSC) technology to mitigate specific frequencies. When we compared the cat-back exhaust system products for this topic, the CORSA 14328 separated the field by specifically targeting drone elimination through patented technology. If you prioritize a smooth ride over raw volume, choose a system with documented sound cancellation rather than a simple resonator delete, which can sometimes increase cabin resonance.
Weld Integrity
Weld integrity is the primary factor in preventing exhaust leaks and structural failure under high heat. Look for TIG welded construction and CNC machined flanges to ensure the joints remain intact over time. The DNA Motoring CBE-SIM utilizes TIG welded CNC machine flanges to maintain pressure and corrosion resistance. Because poor welds are a common failure point in budget systems, prioritize systems that specify the welding method. You should confirm with the manufacturer that the welding covers all joints, as the durability of the 304 stainless steel depends on the quality of these connections.
Weight Reduction
Weight reduction is a secondary benefit of high-quality materials like 304 stainless steel, which offer a high strength-to-weight ratio. The CORSA 14328 and DNA Motoring CBE-SIM both utilize 304 stainless steel construction to ensure the system is durable enough for long-term use. While high-end titanium-wrapped systems represent the peak of weight savings, these stainless steel options provide a reliable balance of weight and longevity. Check the total weight of the kit if your goal is to reduce the vehicle’s overall mass significantly.
Drone Mitigation
Drone mitigation is achieved through internal baffling and material density rather than just pipe diameter. The CORSA 14328 is specifically designed with “No Drone” technology to ensure the exhaust note remains consistent at various RPMs. In contrast, the DNA Motoring CBE-SIM focuses on an aggressive deep tone by deleting the resonator and muffler. If you find that a drone-free experience is your priority, the CORSA 14328 is the specific choice for that requirement. Always verify the muffler’s internal design to ensure it is tuned for your specific engine’s power band.
Understanding the nuances of different configurations is easy when you view the different types of cat-back exhausts.
What You Need vs What These Picks Deliver
Match the job you actually need done to what it requires, then check whether anything on this page reaches that level. Where nothing does, the row says so.
| What you want to do | What that needs | What clears it here |
|---|---|---|
| Achieve a high-end exotic weight reduction | Titanium construction | None of these; a titanium-wrapped system is required |
| Replace the factory rear exhaust | 05-10 Scion TC fitment | Spec-D Tuning Jdm 2.5″ Inlet Ss Catback, DNA Motoring CBE-SIM, CORSA 14328 |
| Improve exhaust note and flow | 2.25″ OD main piping | DNA Motoring CBE-SIM, CORSA 14328 |
Thresholds are the levels this category is generally held to, not manufacturer claims. Check them against your own workload before buying.
Who Buys Cat-back Exhaust Systems, and What It Really Costs
Who buys a Cat-back Exhaust System, and what each one needs
- Daily commuters — a system that eliminates drone frequency at highway speeds
- Track day hobbyists — high-flow inlet and outlet diameters to reduce backpressure
- Street tuners — weld integrity that prevents leaks under high heat cycles
- Scion TC owners — fitment clearance that avoids interference with the chassis
What to budget for on top of the Cat-back Exhaust System
- Exhaust hangers — to ensure proper fitment clearance and vibration dampening
- Hardware kit — to secure the system to the chassis and prevent rattling
- Professional installation labor — to guarantee weld integrity and proper alignment
What you can leave out of the budget
- High-flange adapters — unnecessary if the cat-back system is designed for the specific vehicle
- Titanium-wrapped heat shields — unnecessary for cat-back systems as they do not reach high-end engineering temperatures
Where this kind of product is normally sold
- Online automotive retailers — access to a wider variety of styles with standard shipping windows
- Specialty performance shops — guaranteed fitment clearance and professional installation services
- General marketplaces — lower price points but higher risk regarding weld integrity and material quality
What Buyers Still Want to Know
How much horsepower will these cat-back exhaust systems add?
The DNA Motoring CBE-SIM Catback Exhaust System is designed to increase output by 15 to 25 horsepower or improve low end torque. Other systems like the Spec-D Tuning Jdm 2.5″ Inlet Ss Catback and the CORSA 14328 do not provide specific horsepower figures in their data, so you should verify expected gains with the manufacturer’s performance charts.
Do I need to modify my current muffler or piping for fitment?
The CORSA 14328 Cat-Back Exhaust System is designed as a bolt-on installation, implying it utilizes existing mounting points. For the Spec-D Tuning Jdm 2.5″ Inlet Ss Catback, which fits 05-10 Scion TC models, you must confirm if the factory hangers align with the new system’s mounting brackets before ordering. Because these are cat-back systems, you should verify that your current mid-pipe and catalytic converter are in good condition to ensure a proper connection.
New owners should first learn how a cat-back exhaust works before making a purchase.
Who Should Skip These Cat-back Exhaust Systems
If you require a high-end exotic weight reduction, none of these systems meet the requirement because they lack titanium construction. This page is not for users seeking titanium-wrapped systems or ultra-lightweight racing components.
You should instead look for a full titanium exhaust system if weight is your primary concern. If you are looking for a different vehicle application, see best cat back exhaust system for mazda miata.