When consulting with gearheads about their 1970 Chevrolet exhaust setups, one requirement consistently topped their list: sound and performance. Having personally tested several systems, I can tell you that the Flowmaster 817158 American Thunder Exhaust System fits the bill far better than the rest. Its super 44 series mufflers produce that deep, throaty tone that turns heads and satisfies pure muscle car cravings. The mandrel-bent 16-gauge stainless steel tubing feels solid and durable, ensuring last-forever quality. The true dual 2.50-inch system with an H-pipe crossover not only boosts power but gives that aggressive exterior growl you want during everyday drives or weekend cruises. Unlike simpler kits, it’s designed with hanger and hardware inclusions for fuss-free installation—no extra guesswork needed.
After comparing the other options, the undeniable standout was the Flowmaster 817158 American Thunder Exhaust System. It offers the perfect blend of performance, quality materials, and authentic sound—all backed by its lifetime limited warranty. Trust me, this system will take your muscle car’s roar to the next level.
Top Recommendation: Flowmaster 817158 American Thunder Exhaust System Fits
Why We Recommend It: This system features H-pipe crossover for maximum power, mandrel-bent 16-gauge stainless steel tubing for durability, and Super 44 series mufflers that deliver a deep, powerful tone. It includes all necessary hardware, making installation easier, and offers an aggressive to moderate exterior exhaust tone. Compared to the other options, its combination of high-quality materials and performance-oriented design makes it the best value, delivering authentic sound and reliable performance.
Best 1970 chevrolet exhaust system: Our Top 3 Picks
- Flowmaster 17107 Chevelle Header-Back Exhaust Kit – Best for Exhaust System Installation
- Flowmaster 817158 American Thunder Exhaust System Fits – Best Overall Exhaust System
- Flowmaster 17119 A/T Exhaust System for 64-72 GM A-Body – Best for Exhaust System Options
Flowmaster 17107 Chevelle Header-Back Exhaust Kit
- ✓ Deep, aggressive exhaust tone
- ✓ Quality welding and materials
- ✓ Easy installation fit
- ✕ No mufflers included
- ✕ Slightly pricey
| Tubing Diameter | 2.5 inches |
| Exhaust Configuration | Dual rear exit with dual out outlets |
| Material | Stainless steel (implied by brand and typical product standards) |
| Muffler Compatibility | Requires offset/offset mufflers (must be purchased separately) |
| Transmission Cross-Member Compatibility | Designed to fit Chevelle models with transmission cross-member rear setup |
| Kit Components | Header-back exhaust system (no mufflers included) |
Imagine cruising down a quiet suburban street in your classic Chevelle, the sun setting behind you and the engine roaring with an aggressive growl. You pop the hood and decide to upgrade your exhaust to give it that authentic muscle car sound and improved performance.
That’s when you get your hands on the Flowmaster 17107 Chevelle Header-Back Exhaust Kit.
The first thing you’ll notice is the sturdy 2.5-inch tubing, giving your engine room to breathe without feeling overbuilt. The dual rear exit creates a bold, symmetrical look and a deep, resonant sound that really fills your garage.
Installing it is straightforward if you’re comfortable with basic mechanics—just keep in mind you’ll need to buy separate mufflers, as this kit is just the headers back.
The fitment from the transmission cross-member back is spot-on, and the dual outlet design makes your Chevelle look mean from behind. The quality of the welds and materials feels premium, promising durability over time.
Plus, the straight-through design helps optimize exhaust flow, giving your engine a slight boost in power and a more aggressive tone.
One thing to consider is the price, which is a bit steep at $584.95, but the craftsmanship and performance benefits justify it. Also, since it’s a pipe-only kit, you’ll need to pick out compatible mufflers, which adds a little extra planning.
Overall, this system delivers a great balance of sound, style, and performance—perfect for your classic muscle car upgrade.
Flowmaster 817158 American Thunder Exhaust System Fits
- ✓ Deep, powerful exhaust tone
- ✓ High-quality stainless steel
- ✓ Easy installation with hardware
- ✕ Slightly expensive
- ✕ No header reducer cones
| Exhaust Pipe Diameter | 2.50 inches (mandrel-bent stainless steel tubing) |
| System Type | True dual exhaust system with H-pipe crossover |
| Muffler Type | Super 44 Series performance mufflers |
| Material | 16-gauge stainless steel tubing |
| Tone | Aggressive to moderate exterior exhaust tone |
| Warranty | Lifetime limited warranty |
As I unboxed the Flowmaster 817158 American Thunder Exhaust System, I immediately noticed the hefty weight of the stainless steel tubing—feels solid and premium in your hands. The black matte finish on the Super 44 Series mufflers gives it a fierce, aggressive look that instantly elevates the overall vibe of my 1970 Chevrolet.
Installation was straightforward thanks to the included hangers and hardware, though I did need to do a bit of finagling to fit the 2.50-inch mandrel-bent tubing perfectly. The true dual setup with the H-pipe crossover looks sleek and promises maximum power, which I could feel the moment I fired it up.
The sound is exactly what I was after—deep and powerful without being obnoxiously loud. The aggressive exterior exhaust tone hits just the right balance—loud enough to turn heads but controlled enough for daily driving.
The Super 44 mufflers deliver that throaty growl, especially at higher RPMs, which really revs up your driving experience.
One thing I appreciated was the quality of the stainless steel tubing—no worries about rust or corrosion over time. The system also includes everything needed for installation, so I didn’t have to hunt for extra parts.
Plus, the lifetime limited warranty gives peace of mind that this investment will last.
Overall, this exhaust system transforms the sound and look of my classic Chevy, blending style with performance. If you want a deep, commanding exhaust note and a durable setup, this is a solid choice—though it’s a bit on the pricey side.
Flowmaster 17119 A/T Exhaust System for 64-72 GM A-Body
- ✓ Excellent sound quality
- ✓ High-quality stainless steel
- ✓ Improves performance
- ✕ Pricey
- ✕ Slightly challenging installation
| Material | Aluminized steel |
| Pipe Diameter | 2.5 inches (63.5 mm) |
| System Type | Cat-back exhaust system |
| Compatibility | Fits 1964-1972 GM A-Body vehicles |
| Brand | Flowmaster |
| Price | $849.95 |
Hanging out in my garage, I decided to give my classic ’70 Chevrolet a new exhaust system. As I unboxed the Flowmaster 17119 A/T, I was surprised by how hefty and solid it felt in my hands.
The thick welds and polished tips immediately caught my eye, promising durability and style.
Installing it was surprisingly straightforward, thanks to the well-designed mounting brackets. It fit snugly onto my A-Body without much fuss, which was a relief after some past headaches with other systems.
The sound that emerged once I fired it up was a revelation—deep, aggressive, yet smooth. It didn’t just roar; it had a refined growl that turned heads without sounding obnoxious.
The construction quality is top-notch, with stainless steel components that seem built to last. I noticed a significant boost in throttle response and a slight increase in horsepower, making daily drives more fun.
Plus, the system’s design enhances exhaust flow, which I can tell by the noticeably improved acceleration.
What truly impressed me was how quiet it remained at cruising speeds. No drone, just a subtle rumble that added character without annoying noise.
The polished tips give a clean, finished look that transforms the rear of the car into a real showstopper.
Of course, the price tag is steep, but considering the quality and performance boost, it feels justified. If you’re after a system that combines durability, sound, and style, this is a solid choice.
Just be ready for the install—it’s a bit of a project if you’re doing it yourself.