Classic Chambered Exhaust Inc.

Special 40" long bodied Powerstick for a '67 Corvette Stingray. 3.5" outer body diameter, large High-Flowing 2.5" Core flows WAAAY more cfm than the OEM type mufflers. Sound is super deep & awesome, minimal backrapping or popping. Add significant HP vs. stock.

Products

NEW - TRUE 3" VERSIONS AVAILABLE NOW!

Internal showing the new, true 3" Flowpath & small louvers.

The new 3030SB with 3" Flowpath, & compact 3-1/2" body diameter.

NOTE: Overall length is approximate. Inlet / Outlet bushing lengths can vary some. Use the body length to determine what muffler will best fit your application. It may be necessary for an installer to shorten or lengthen the bushings, or modify the diameter for proper fit into your application. Powerstick bushings are expandable. An experienced exhaust installer will know how much the steel will stretch.

SHORT POWERSTICK

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH

2" 2018SB 2-1/4" 3" 14" 18"

2-1/4" 22520SB 2-1/4" 3" 16" 20"

2-1/2" 2520SB 2-1/2" 3-1/2" 16" 21"

3" 3020SB 3" 3-1/2" 16" 21"

MEDIUM POWERSTICK

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH

2" 2022SB 2-1/4" 3" 18" 22"

2-1/4" 22524SB 2-1/4" 3" 20" 24"

2-1/2" 2524SB 2-1/2" 3-1/2" 20" 25"

3" 3026SB 3" 3-1/2" 20" 25"

LONG POWERSTICK

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH

2" 2026SB 2-1/4" 3" 22" 26"

2-1/4" 22530SB 2-1/4" 3" 26" 30"

2-1/2" 2530SB 2-1/2" 3-1/2" 26" 31"

3" 3030SB 3" 3-1/2" 26" 31"

Sidepipe Insert Mufflers - popular on Corvettes & some Cobras.
The expanded ends slip just inside a 4" OD sidepipe - slots cut into each end can be tweaked slightly in order to keep constant tension against the inside of the sidepipe during exhaust heating & cooling cycles. This eliminates rattling & loose fits. Now you can have the unique chambered sound & superior flow through your sidepipes.
NOTE: 2.5" core versions are quieter than 3" core versions.
*These can be made in different lengths as well - inquire.

Sidepipe Insert Muffler

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH

4" 2530-IN 2-1/2" 3-1/2" 26" 33-1/4"

4" 3030-IN 3" 3-1/2" 26" 33-1/4"

sidepipe
22540-VETTE

Sidepipe Mufflers for mid-late 60's Vettes
High Flow / Non-Restrictive:

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH

2-1/4" 22540-VETTE 2-1/4" 3" 40" 46"

2-1/2" 2540-VETTE 2-1/2" 3-1/2" 40" 46"

3" 3040-VETTE 3" 3-1/2" 40" 46"

VettePack™ Sidepipe Mufflers for C-2 & C-3 Vettes:

This revolutionary concept combines a Chambered Section for unique sound tuning, & a sound-deadened Resonator Section for noise absorption. Chambered & Resonator section lengths can be varied for louder or quieter results desired. *The most popular is 20” of chambered, & 20” of resonator. The result is a softer tone, but with the legendary DEEP Powerstick Chambered rumble. The best of both worlds. Available with *NEW* 2” core & 3” body (Quietest version), 2.25” core & 3” body, or 2.5” core & 3.5” body.
(*NOTE: The 3” & 3.5” bodies will both fit under stock C-2 sidepipe covers. Only 3” body mufflers will fit under C-3 sidepipe covers)

OE Core
Photo showing tiny 1-5/8” OE Core

Chambered VettePack , High Flow / Non-Restrictive:

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH

2" 2040-VP 2" 3" 40" 44"

2-1/4" 22540-VP 2-1/4" 3" 40" 44"

2-1/2" 2540-VP 2-1/2" 3-1/2" 40" 45"

Click here to see a Corvette sidepipe retrofit using 2.5” flowpath VettePack Mufflers

VettePack YouTube - Video

Thanks to L.B. of Scottsdale, AZ. for this clip. His car is a 1965 Corvette 327/365 HP. Here's his commentary:

I bought a 65 with sidepipes and posted a similar problem a few weeks ago. They were an original repro. of the GM's. Just yesterday (Mon.) I had the chambered portion removed and replaced with a section consisting of 1/2 chambered and 1/2 resonator made by Classic Chambered. ERIC at Classic, said he had never tried this particular combination and hoped it worked. I made an HD video of the before and will be doing one in a few days to show the difference. It may be hard to hear the sound difference on a computer. The sound seems to be reduced in volume by 1/4>1/3 of what it was. It is a lower rumble and they are still louder than most exhausts. The original sound was very annoying and the new sound has a much better tone. When I finish the video I'll post both of them. GOOD LUCK!

From www.corvetteforum.com (May 2012 – Thanks to Eric in Boyington Beach, FL.)

Since installing a set of OBX Stainless side pipes I've been trying to find a set of inserts that flowed well but sounded good at a reasonable volume. I started with the Hooker Max Flows that sounded nice at idle but after that they were super loud and unbearable on the interstate. Second I tried the Hooker regular glass packs (not reverse flow) and they sounded much better volume wise but the tone was just ok but the back pressure was horrible.

I called Eric at Classic Chambered Exhaust and asked about making a set of the VettePack mufflers he makes for C2 cars. He said no problem though he'd never made a set for the hooker styled pipes but was game. A few weeks later they arrived and I started the install.

The design is great and easy to bend the tabs so the inserts slide in with some resistance and no vibration and rattles. The sound is super. They have the right amount of volume and sound great through the rpm. At 70 mph on the interstate you can hear them but still talk to a passenger in my case with the windows down an air conditioned car would have no problem at all. When you get in it or just taking off heavy footed from a light heads will turn cause everyone can hear the sweet music your car will be making.

Happy to say the least and found working with Eric a pleasure. Here is a quick clip. I'll shoot a driving video next and post it.

NEW! VettePack Insert Muffler
Now – GREAT Tone & Sound Control with GREAT Flow!
(2.5” Core Only) Special Ends Fit INSIDE 4” OD Sidepipes – NO RATTLING!

IN/OUT	PART#	CORE	BODY DIA.	BODY LENGTH	OA LENGTH
4"	25VP-IN	2-1/2"	3-1/2"	12” Chambered 14” Resonator Combo	33-1/4"

NEW! Sidepipe Louver Core Inserts With Sound Deadening Wrap
Lightweight & 3” Core Now Fits! (2.5” Core Also Available)
Special Ends Fit INSIDE 4” OD Sidepipes – NO RATTLING!

3” Core Louvered Insert w/Special Ends to Slip Inside a 4” OD

Photo showing the sound-deadening wrap

IN/OUT	PART#	CORE	BODY DIA.	BODY LENGTH	OA LENGTH
4"	25LV-IN	2-1/2"	N/A	N/A	33-1/4"
4"	30LV-IN	3"	N/A	N/A	33-1/4"

VETTE-TIP

NEW ITEM! C-2 Corvette Sidepipe Turndown

Polished 304 Stainless. (OE Tips were chrome plated – these will NOT rust or corrode!)
2-3/4” OD diameter like OE, with the inlet end swaged-down to 2.5” ID.
Mandrel-Bent. 12” Long & can be trimmed down to desired length. Can be clamped or welded to chambered muffler outlet.

*This is a heavy, high quality stainless tip. Does have some slight tooling marks, but none on the actual turndown area which is all that is visible.

IN	PART#	BODY DIA.	OUT	OA LENGTH (Approx.)
2-1/2"	VETTE-TIP	2-3/4"	2-3/4"	12"
3"	VETTE-TIP_3	3"	3"	15"

RESONATOR

CLASSIC CHAMBERED 12" RESONATORS

Resonators reduce noise levels without providing additional backpressure, & they reduce annoying resonance or "drone" in the 1800-2300 RPM range sometimes associated with performance exhaust systems. The Classic Chambered resonators are compact & can be installed into tight spots where there is a small straightaway section of pipe - like in tailpipes.
Like all Classic Chambered products, these are proudly made in the USA!

All Include Large, Free-Flowing Cores, & Fiberglass Woven Packing for Sound Absorption
Constructed of Heavy 16 Gauge Aluminized Steel
(Muffler Necks can be cut off & Resonators can be welded-in)

CLASSIC CHAMBERED 12" RESONATORS

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH
(Approx.)

2-1/4" 225-RES 2-1/4" 3-1/2" 12" 17"

2-1/2" 25-RES 2-1/2" 3-1/2" 12" 17"

3" 30-RES 3" 4" 12" 17"

COBRAPACK Mufflers - Legends In Their Own Time

OEM & Cobra Kit Car - High Flow Replacement Sidepipe Mufflers - Build Your Own:
You have limited choices in exhaust configuration for the Cobras, choose wisely!
There are 3 choices - decide what advantage is important to you.

1. You can be QUIET & lose major HP (stock).
2. You can be a little louder, sound great, be totally streetable, & gain MAJOR HP.
3. You can be downright aggressive loud, sound great, & gain MAJOR HP.

You can accomplish # 2 & 3 with Cobrapack Mufflers. #2 pertains to mufflers with packing. The longer they are, the quieter they will be. #3 pertains to those wanting raw, wicked V-8 sound. If you don't believe what advantage choosing the right mufflers can give you, see our PERFORMANCE page. Once you look at the charts, you'll think this is fantasy. If you don't believe the numbers, then Kinetic Racing Engines provided us with lies. The other option of course is to keep running your "stock" kit car mufflers, & scold your engine builder for coming up 100 HP short of what he promised you! Think about it, do you see any logic in running ANY V-8 through a 1-7/8" flowpath? That's the "Cobra-Killer." Now that you've seen the light, WELCOME ABOARD!

20-to-32" Long Bodies
2 Versions of each: PACKED with INSULATION for sound absorption, or UNPACKED for more aggressive sound!
2-1/2" OD & 3" OD Flowpaths, 4" OD Smooth Bodies
HUGE Gains in HP & Torque vs. Stock (*See "PERFORMANCE" page)
Beefy 16-Gauge Aluminized Steel Construction
* 2.5" flowpath mufflers are recommended for engines producing under 450 flywheel horsepower
* 3" flowpath mufflers are recommended for engines producing over 450 flywheel horsepower

NOTE: COBRAPACKS are typically louder than stock mufflers, they may exceed legal noise levels where enforced. * 2-1/2" Versions are quieter than 3". Dyno results on 3" versions have shown gains of 100+ HP vs. stock mufflers at certain RPM ranges. See PERFORMANCE page for details.

COBRAPACKS require some fabrication of ends to install, and can be painted or powder coated.

Cobra
In-side view

cobra
COBRAPACK MUFFLER

FROM OUR CUSTOMERS:

Classic Chambered,
Thought you might be interested in these pictures. The mufflers shown were from my stock Contemporary Cobra sidepipes. Can you believe how restrictive these things are? I have never seen a core design like this before - it looks like something was inserted in there and bent up purposely. I have a 482 cu. in. Ford sideoiler going into this car.

Thanks, Doug

COBRAPACK MUFFLERS – 2.5” OD Flowpath (*under 450 HP)
(NO PACKING - More Aggressive Sound)

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH
(Approx.)

3 2520-COBRA 2-1/2" 4" 20" 26"

3 2522-COBRA 2-1/2" 4" 22" 28"

3 2524-COBRA 2-1/2" 4" 24" 30"

3 2526-COBRA 2-1/2" 4" 26" 32"

3 2528-COBRA 2-1/2" 4" 28" 34"

3 2530-COBRA 2-1/2" 4" 30" 36"

3 2532-COBRA 2-1/2" 4" 32" 38"

COBRAPACK MUFFLERS – 2.5” OD Flowpath (*under 450 HP)
(WITH PACKING - Better Noise Reduction)

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH
(Approx.)

3 2520-COBRA-P 2-1/2" 4" 20" 26"

3 2522-COBRA-P 2-1/2" 4" 22" 28"

3 2524-COBRA-P 2-1/2" 4" 24" 30"

3 2526-COBRA-P 2-1/2" 4" 26" 32"

3 2528-COBRA-P 2-1/2" 4" 28" 34"

3 2530-COBRA-P 2-1/2" 4" 30" 36"

3 2532-COBRA-P 2-1/2" 4" 32" 38"

COBRAPACK MUFFLERS – 3” OD Flowpath (*Over 450 HP)
(NO PACKING - More Aggressive Sound)

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH
(Approx.)

3 3020-COBRA 3" 4" 20" 26"

3 3022-COBRA 3" 4" 22" 28"

3 3024-COBRA 3" 4" 24" 30"

3 3026-COBRA 3" 4" 26" 32"

3 3028-COBRA 3" 4" 28" 34"

3 3030-COBRA 3" 4" 30" 36"

3 3032-COBRA 3" 4" 32" 38"

COBRAPACK MUFFLERS – 3” OD Flowpath (*Over 450 HP)
(WITH PACKING - Better Noise Reduction)

IN/OUT PART# CORE BODY DIA. BODY LENGTH OA LENGTH
(Approx.)

3 3020-COBRA-P 3" 4" 20" 26"

3 3022-COBRA-P 3" 4" 22" 28"

3 3024-COBRA-P 3" 4" 24" 30"

3 3026-COBRA-P 3" 4" 26" 32"

3 3028-COBRA-P 3" 4" 28" 34"

3 3030-COBRA-P 3" 4" 30" 36"

3 3032-COBRA-P 3" 4" 32" 38"

turndown.jpg - 4879 Bytes
3.5”: Turndown Part # 35-Tip
4”: Turndown Part # 40-Tip
Funnel Cone. # 3530-AD

Exhaust Accessories for Cobras:

* 3.5" OD Aluminized Steel Mandrel-Bent Turndowns. (16-gauge, 12" long) *Cut to desired length & weld to muffler outlet. (Part #: 35-Tip)
*NEW* - 4” OD x 12” Long Mandrel-Bent Turndowns – same construction as the 3.5”. (Part#: 40-Tip)
* 3” Funnel Cone flares up to a little more than 3.5”. Butt-weld the 3” end to the muffler inlet (you can cut the muffler inlet a little shorter), & “work” the flared end (grind or file) so that it fits just inside your 3.5” OD collector. The goal is to smoothly "funnel" exhaust into the COBRAPACK Muffler to eliminate any flow turbulence as the exhaust enters the smaller entry into the muffler. *Once installed, you will NOT see these transition cones – they hide inside the collector. Strongly recommended to use these! (Part #: 3530-AD)

EXHAUST ACCESSORIES for Cobras:	PART#
3.5" OD Mandrel-Bent Turndowns	35-Tip
4" OD Mandrel-Bent Turndowns	40-Tip
3" ID to 3.5 Funnel Cone	3530-AD

4” OD SIDEPIPE HEAT SHIELDS – Cobras / Corvettes!

Slotted or Solid Styles – 30” Lengths

Polished 304 Stainless
Chrome Clamps & SS Hardware Included
Made in USA!

HEAT SHIELDS Fits 4” OD Dia:	PART#
30” Slotted	HS4-30SL
30” Solid	HS4-30SD

November 2013:
New added items to our line are these stamped X-pipe assemblies
Sizes 2.25”, 2.5”, & 3”.
They are available in aluminized steel or 409 Stainless.
X-pipes balance pressures between both exhaust banks on dual exhaust applications, and help with sound wave cancellation & mellowing of the exhaust note.
X-pipes typically assist with scavenging & can add a few more HP in some instances.
The stamped design allows for a more compact style, with more precise & better-flowing internals than typical cut-and-weld design X-pipes.

AVAILABLE NOW FROM CLASSIC CHAMBERED!

SIZE	TYPE:	PART#
2.25"	Aluminized	X225-AZ
2.25"	Stainless	X225-SS
2.5"	Aluminized	X25-AZ
2.5"	Stainless	X25-SS
3"	Aluminized	X30-AZ
3"	Stainless	X30-SS

Now You Can Purchase Direct From Us
(Click Here)

Classic Chambered Exhaust Inc. · P.O. Box 426 · Highland, MI. 48357
(248) 889-HEMI (4364) · E-Mail