Many users assume that any exhaust upgrade will give their ’70 Chevelle SS a boost, but my extensive testing proves otherwise. I’ve installed and driven with both options, feeling the difference firsthand. The Chevy Big Block Exhaust Header Kit 396-502 Chevelle/Camaro impressed me with its high-grade 304 stainless steel. It’s built tough, resists corrosion, and handles heat perfectly—perfect for long-term performance.
Compared to the XsvFLO ShopLine Single Catback Exhaust, which offers a sleek OEM look with a bit more sound, the headers deliver noticeable gains in torque and horsepower, especially under demanding conditions. The advanced TIG welding and CNC precision mean a secure fit and reliable flow, making it a clear choice for serious enthusiasts who want durability plus performance. After thorough testing, I confidently recommend it for anyone seeking real value and quality.
Top Recommendation: Chevy Big Block Exhaust Header Kit 396-502 Chevelle/Camaro
Why We Recommend It: This kit’s premium 304 stainless steel offers superior corrosion resistance and heat tolerance. The CNC and TIG welding ensure precise fit and durability, exceeding the usual standards. It directly enhances engine performance—something the aftermarket catback can’t match—making it the smartest choice for a true muscle car upgrade.
Best stock exhaust for 1970 chevelle ss: Our Top 2 Picks
- Chevy Big Block Exhaust Header Kit 396-502 Chevelle/Camaro – Best OEM stock exhaust for 1970 Chevelle SS
- XsvFLO ShopLine Single Catback Exhaust 3″ Aluminized – Best upgrade for stock exhaust system for 1970 Chevelle SS
Chevy Big Block Exhaust Header Kit 396-502 Chevelle/Camaro
- ✓ Premium stainless steel build
- ✓ Precise CNC and TIG welding
- ✓ Extended 5-year warranty
- ✕ Slightly higher price
- ✕ Professional installation recommended
| Material | Premium 304 stainless steel |
| Construction Technology | TIG welded and CNC machined |
| Compatibility | Chevy Big Block 396/402/427/454/502 engines |
| Warranty | Extended 5-year warranty |
| Application | Fits 1970 Chevelle SS, Camaro, El Camino, Caprice, Kingswood, Laguna, Malibu, Impala, Bel Air, Biscayne, Brockwood, Townsman |
| Price | $246.69 |
Imagine you’re finally ready to upgrade your 1970 Chevelle SS, and you’ve got your eye on that perfect, authentic sound. You crack open the box of this Chevy Big Block Exhaust Header Kit, and the first thing you notice is the pristine, shiny 304 stainless steel finish.
It feels solid and premium, promising durability even under the intense heat of daily driving or spirited runs.
The fitment is impressively precise—thanks to CNC technology, the welds are clean and tight. You can tell this kit was built with care, designed to match your big block Chevy perfectly.
Installing it feels straightforward, especially with the TIG welded connections that eliminate leaks and improve flow.
Once installed, the difference in sound is noticeable without being overwhelming. It gives your Chevelle a deeper, more aggressive tone—just enough to turn heads at the stoplight.
The stainless steel construction also means you won’t worry about rust or corrosion, even if you take your car to the track or leave it outside overnight.
What stands out most is the extended 5-year warranty. That kind of backing gives you peace of mind, knowing this kit is built to last.
Plus, with the high-grade materials and precision welding, you get a product that looks as good as it performs.
Sure, it’s a bit of an investment at around $247, but the quality and fit make it worth every penny. If you’re aiming for that classic, stock look with enhanced performance, this header kit checks all the boxes.
XsvFLO ShopLine Single Catback Exhaust 3″ Aluminized
- ✓ OEM look with added sound
- ✓ Genuine Flowmaster muffler
- ✓ Easy to install
- ✕ Slightly higher price
- ✕ Not as loud as aftermarket kits
| Material | Aluminized steel |
| Exhaust Diameter | 3 inches |
| Muffler Type | Flowmaster OEM-style muffler |
| Exhaust Exit Location | Behind passenger rear wheel |
| Sound Profile | Enhanced sound with OEM appearance |
| Price | $249.99 |
Compared to the typical aftermarket exhausts I’ve handled, the XsvFLO ShopLine Single Catback really catches your eye with its OEM-inspired look. It’s not trying to be overly aggressive or flashy; instead, it blends seamlessly with the classic 1970 Chevelle SS design while giving that subtle, throaty sound that turns heads.
The 3-inch aluminized pipe feels sturdy yet relatively lightweight when you lift it. Installing it behind the passenger rear wheel is straightforward, thanks to the well-made flanges and clear instructions.
I noticed the flowmaster muffler included is genuine, which means you get that familiar, deep tone without the drone or harshness.
What really stands out is how well it balances sound and appearance. At idle, it’s quiet enough not to annoy neighbors, but revving it up unleashes a satisfying growl that’s perfect for cruising or showing off.
The aluminized finish holds up well against rust and road grime, giving you confidence that it’ll last for years.
On the road, the exhaust feels smooth and unobtrusive—no rattles or vibrations. It’s a great upgrade if you want a tasteful, performance-oriented sound without sacrificing the classic look of your Chevelle.
Plus, the price point of $249.99 feels fair for the quality and authenticity you get.
Overall, this exhaust is a smart choice for anyone wanting to enhance their muscle car’s sound and style without going overboard. It’s simple, effective, and delivers exactly what you need for a vintage ride.