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P.O. Box 424 · Milford, MI. 48381 · (248) 889-4364
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POWERSTICKS & AccuSeals - Awarded Best New Performance Products of 2004 by RPM Motoring Monthly! |
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ProductsNEW - TRUE 3" VERSIONS AVAILABLE NOW!
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.
Sidepipe Insert Mufflers - popular on Corvettes & some Cobras.
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*NEW* Sidepipe Muffler for mid-late 60's Vettes - Chambered VettePack:
This new design combines a 26" Chambered Section for unique sound tuning,
& a 12" packed Resonator Section for noise absorption. The result is a softer tone,
but with the legendary DEEP Powerstick Chambered rumble.
The best of both worlds. One size only.
| Chambered VettePack High Flow / Non-Restrictive: |
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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! |
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NEW ITEM! C-2 Corvette Sidepipe TurndownPolished 304 Stainless. (OE Tips were chrome plated these will NOT rust or corrode!) *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.
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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 | ||||||||||||||||||||||||
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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.
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| COBRAPACK MUFFLERS 2.5 OD Flowpath (*under 450 HP) (NO PACKING - More Aggressive Sound) |
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| COBRAPACK MUFFLERS 2.5 OD Flowpath (*under 450 HP) (WITH PACKING - Better Noise Reduction) |
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| COBRAPACK MUFFLERS 3 OD Flowpath (*Over 450 HP) (NO PACKING - More Aggressive Sound) |
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| COBRAPACK MUFFLERS 3 OD Flowpath (*Over 450 HP) (WITH PACKING - Better Noise Reduction) |
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 Turndown Part # 35-Tip |
 Reducer Part # 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)
- * 3.5" OD to 3" ID Reducer. Trim both ends to fit. Cut at the transition area to fit just inside 3.5" OD collectors, butt-weld the 3" ID end to the muffler inlet. The goal is to smoothly "funnel" exhaust into the COBRAPACK Muffler. (Part #: 3530-AD)
Here is the procedure to install the inlet funnels part # 3530-AD.
One end of the adapter is 3.5 OD, the other end is 3 OD.
 Showing inlet end of Cobrapack & new adapter |
 Cut off the 3 muffler inlet & cut adapter close at the 3 end |
 File all burrs off muffler & adapter |
 Butt-weld adapter to muffler |
 Cut-off excess 3.5 diameter adapter leave it a little big for further trimming/grinding as this will just barely fit inside of the merge collector 3.5 OD end: (all you are using is the flare area) |
 Photo showing the adapters trimmed nice smooth transitions into the muffler flowpaths. All of this will hide inside the collectors & your collectors weld to the muffler body. This eliminates severe turbulence caused when stock type mufflers are welded to the collectors. Stock mufflers usually have internal cores / flowpaths of less than 2 diameter. Combine tiny cores along with sloppy transitions into the mufflers & this makes for really inefficient & restrictive exhaust. You will lose major HP & Torque because of this small block or big block applications! |
These photos show the 3-pieces that make a re-do of a Cobra sidepipe muffler. The 3.5 OD turndown fits over the 3 ID muffler neck the muffler neck can be trimmed off or left on. You can re-use your turndowns, or purchase new ones from us. They can be trimmed to shorten the overall length or the turndown area of the spout. Our turndowns are mandrel-bent, 16-gauge aluminized steel. They can be ceramic coated or painted. They are made in the USA, like all of the products we produce.
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Now You Can Purchase Direct From Us
(Click Here)
Classic Chambered Exhaust Inc. · P.O. Box 424 · Milford, MI. 48381
(248) 889-HEMI (4364) · E-Mail