1970 Z28Transverse muffler sugestions
 

After a little carb tuning & valve lash adjustments this morning. I took my Z for a spirited rip thru the gears to make sure everything was good . the car is a 34,000 mile original car retaining most of its original exhaust & muffler . But now as a result of todays drive I blew a huge hole rite out the middle of the original transverse muffler, Any suggestions on a "OEM style " muffler with a little more aggressive sound ??? Thanks

Here is an original one.

https://www.ebay.com/itm/NOS-STILL-I...-/264596520964

I had an aftermarket Walker on mine years ago and it was a pretty good sounding Muffler.

I went ahead and put a GM 3983066 back on and was actually disappointed in the exhaust note. That muffler is "new car quiet" with stock exhaust manifolds.

Check out (The Parts Place Inc.).

The Walker mite be exactly what I’m looking for ? The OEM muffler is very quiet, I want something a bit more Hi performance sounding without being obnoxious, any idea on muffler name or part # ? Thanks

Here is a much more cost effective option for correct transverse muffler ($125) or a correct complete exhaust system. Quality is said to be on par with Gardner system at a much more affordable price. Haven't personally used it.

https://joeysmusclecars.com/shop/

Bet your original system sounds pretty aggressive now with the hole in the muffler. :-)

Read this first:

https://nastyz28.com/threads/nos-197...8-l-34.308502/

There are slight size differences..

Pypes has several, here is one...

https://pypesexhaust.com/i-12200969-...0.html#reviews

Here: https://www.summitracing.com/parts/imo-or114

Jeff, I have Walker Turbo Mufflers on my ‘69 Z28 in a true dual custom rolled system. It sounds great. Loud enough when you want I to be but quiet when want it to be too. Doesn’t sound like a diesel truck. Not tinny. No reverb Or resonance in the cabin. 100% better than Slow Master mufflers. I suggest it!

Being a low mile original car I'll assume you aren't looking for aftermarket upgraded exhaust systems, even though there are a couple of excellent crossflow systems out there that I use and am very happy with. Pypes and Dynomax.

Dynomax offers the transverse mufflers separately, and they have a very nice sound without being obnoxious or overly aggressive, and also have the correct flow path as OEM (Pypes is different) but they are 2 1/2" inlet and outlet.

The OEM system are only 2 1/4" inlets with 2" outlets. If you want to keep those sizes and correct appearance/fit then Waldron might be another option.

They sell just a transverse muffler, said to flow a little better than a stock muffler with internal dimensions larger than stock, and will make them to any inlet/outlet size you want, in aluminized material or stainless steel. However I do not know what they sound like, I've never tried one myself.

http://waldronexhaust.com/cart/index...oducts_id=4689

http://waldronexhaust.com/cart/index...oducts_id=4690

Love to know what the waldron "Impostor" muffler sounds like. Stainless steel with stock outlets sizes for factory style tailpipes could be a nice compromise of performance sound and stock looks from behind.

I agree, this could be the of both worlds, if only I new what the muffler sounded like ? I appreciate all the input from everybody . Same goes with the Joey's Muscle Cars set up , seems to be a quality / cost effective set up , but the tone of the muffler is still a major concern

My plan is to try one of those at some point on one of the cars.

I currently run a complete Pypes transverse system on our Z, reasons are 2 fold. I wanted a performance increase with larger piping, mandrel bends and an "X" cross over, and I had planned to run the car in PS and the rules allow such an upgrade. However stock appearance is important to me so I grafted in the stock 2" tail pipes to keep a stock appearance when looking at the car from the rear.

https://youtu.be/IZ0HlEY7b74

I have several second gen Camaros, with various exhaust systems. I recently put a Joey Gray exhaust system on a stock L78. It sounds bad to the bone! I am very happy with it. I just bought 2 more mufflers from him at Carlisle.

Good to hear , as I was leaning towards getting one of his complete exaust systems .My only concern was the tone of his muffler ?! Does he have more than one muffler option ? Thanks for the input

Always great to get firsthand feedback. Does your L-78 car have headers or exhaust manifolds?

Check out Waldron exhaust sound clips here

https://www.youtube.com/user/WaldronExhaust/videos

stock exhaust manifolds with smog

Great link. They have a 69 Firebird with the Imposter muffler which is their loudest and it's seems quite fine. Sounds healthy without being too loud.

I just went through this, I decided to go dual instead of transverse, it’s tucked up so nice I can back up over a cub on Woodward to park there, and there is plenty of clearance. I went with a straight through Borla, quiet till you get on it. Life time warranty too.

After considering all the suggestions & input from you guys, I decided today to order a complete Waldron tranverse system with the optional Imposter muffler being the deciding factor , only to be told it will take 8 to 10 weeks because the mufflers are out of stock and made to order. But Joeys Muscle cars has complete systems in stock ready to go with OEM style sounding muffler. All things considered both are in the same ball park cost wise. I always tend to over think everything especially when it comes to my cars !!! Hmmm ?

Either route seems like a good choice. If you didn't want to wait, you could get the system from Joey's now and then if later you wanted a more aggressive sound just swap out the muffler for the "Imposter" from Waldron.

Good advice,that's what I would do. http://waldronexhaust.com/muffleroptions.htm

Just ordered the complete Waldron system w/the Imposter muffler, minus the chrome tipped tail pipes which they don't offer ,and my originals are mint so, Fingers Crossed !!!

Nice, please post a follow up once you get it all installed and perhaps a sound clip and your impressions. I'm going to be in the market as well and would really appreciate your first hand impressions.

Will do! it will be a little while though, I was told 7-8 weeks wait as the mufflers are made to order and they are short handed employee wise due to the covid . Would of really liked to have ordered a system from Joey , which he said he could have shipped out in a few days. But the muffler option of Waldrons ended up being the deciding factor and I didn't really want to mix & match in case of fitment issues ? Want to thank everybody again for all the suggestions, links & advice.

'So i finally got my complete Waldrons exaust system installed on my Z28. out of the box everything looked great. But during installation i had a few minor issues with fit. With the most signifigant being the right side head pipe coming out of the manifold was a inch or two longer compared to the original oem pipe that we removed, which in turn thru everything off the rest of the way back including the muffler being way out of wack as far as fitting in the limited space behind the rear axle. No biggie , just had to go back and trim a good inch at he front of the head pipe to get every thing to fit as it should. Since all my original hangers were fine i decided to reuse all of them. Everything lined up pretty good , but the entire system felt a little snug to the bottom of the car,And the aluminized finish looked great . but Once the car was started I was immediately disappointed with the Tone of the optional "Imposter" muffler which was supposed to have a more aggressive sound than a stock style replacement . New car quite is all i got ! It dosent sound bad at the rear of the car , but at idle and going thru the gears even at full throttle it just dosent have the sound i hoped for. not sure how a Solid lifter,11.1 motor can sound so tame ? HaHa , the car does have all its born with California smog in place for what its worth

Thanks for the report. Makes me not want to try an Imposter muffler. If still unhappy and not too worried about originality (can't really see much of the muffler anyway) a popular option would be to swap out the transverse for one of these cross flow mufflers from Dynomax and it's relatively inexpensive. They are a great sounding muffler.

https://www.jegs.com/i/Dynomax/289/1...aAsa3EALw_wcB#

Not sure what pipe diameter you ended up with but they make these in 2 1/4" and 2 1/2" I linked the 2 1/4"

Good reading here, muffler in my 69 is started to rot through, haven't even gotten 1,500 miles on car and it was aluminized but has always spit out orange rusty water from condensation so I'm kind of liking the Dynomax listed above but wont tailpipes need to be swedged up to 2.25?

Yes you can graft in your factory tailpipes. I did on our 69Z. It's actually pretty easy if you use the 2.25" Dynomax muffler. The 2" factory tailpipes are only 1/8" difference around the circumference.

I installed ones those kits from drclassic with the Thrush transverse muffler.https://www.youtube.com/watch?v=ueoBhUQknco