Help with exhaust choice - Team Camaro Tech
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post #1 of 17 (permalink) Old Sep 22nd, 05, 12:41 PM Thread Starter
ET
 
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Help with exhaust choice

1968 Z/28, stock manifolds, real 302...

Basically I want a "stock" system. It doesn't have to be technically correct (the first person to bend over and look for factory markings on the exhaust gets a kick in the pants), but I want the transverse muffler and it should exit as per the factory. It needs to bolt-up to the stock manifolds.

Here's the issue. I don't know what a true stock Z/28 exhaust sounds like... you know from the factory as delivered. Anybody out there old enough and still of sound mind to remember its sound. I'm just looking for a light rumble. In other words, it needs to be "drive-throughable"... not so loud at idle that you can't go through a drive-through window without yelling. Would a "repro" factory system be too quiet? Any thoughts? I don't want to drop $300-600 and not be happy with it.
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post #2 of 17 (permalink) Old Sep 22nd, 05, 01:17 PM
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Re: Help with exhaust choice

I put a repro dual system on my 68 with 327 and headers. It sounded nice, if a little "blatty/raspy" at mid-throttle under load. It would have a completely different tone through the manifolds, I suspect.

I really doubt you're going to get what you want in an off the shelf system. The Flowmaster with transverse muffler (17104??) is pretty liveable. I have a buddy with that system on his 68 350 vert, and it's pretty much just right in terms of noise/tone. But, that system is made to work with headers, so you'd have to fabricate the head pipes.

Pypes has some decent systems, but the headpipes are separate, so in my mind that's just one more joint to leak.

My guess is you're going to have to get the repro system and be happy with whatever "rumble" it makes, unless you want to get repro pipes and try to fit them to an aftermarket transverse muffler. I think that's what I may end up doing on the 69, because I'm in the same boat. Big block with manifolds, want a transverse muffler, stock pipe routing, but not too quiet.

So, I guess I can tack on/hi jack the thread wondering what an SS396 through a factory system sounded like...

Eric
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!
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post #3 of 17 (permalink) Old Sep 22nd, 05, 02:24 PM
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Jeff
 
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Re: Help with exhaust choice

I think Pypes Exhaust offers a stock style transverse setup that is larger size than stock. This should offer better performance but still look pretty correct. It looks like you might need to get the muffler separately which is a Dynomax Ultraflow muffler.

Pypes Crossflow System

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post #4 of 17 (permalink) Old Sep 22nd, 05, 03:06 PM
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Re: Help with exhaust choice

Yeah Jeff, that's the Pypes system I was talking about. They do offer the manifold head pipes as separate pieces, so instead of one pipe from the manifold back to the overaxle pipes, you have two pieces clamped or welded together.

Eric
69 'vert project big block/TKO 600 RR
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post #5 of 17 (permalink) Old Sep 22nd, 05, 09:52 PM Thread Starter
ET
 
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Re: Help with exhaust choice

Most folks say to weld the system after install. Is it necessary? Will it leak bad if I don't?
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post #6 of 17 (permalink) Old Sep 22nd, 05, 09:58 PM
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Re: Help with exhaust choice

Maybe. I don't like to weld them, because I like to able to remove the different pieces. I use stainless steel band clamps, because they grip all the way around and don't crimp the pipes like U-clamps do. The band clamps are more expensive at around $8.50 each from Summit, but once you use them you can never go back.

Eric
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post #7 of 17 (permalink) Old Sep 22nd, 05, 10:14 PM
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Re: Help with exhaust choice

I bought my complete stock tranvserse system from Rick's and it bolted right in place with the factory style clamps. I put it in by myself. I like the sound it makes also, not too loud and not too quiet. That classic muscle car sound is what I would call it.

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post #8 of 17 (permalink) Old Sep 22nd, 05, 10:34 PM Thread Starter
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Re: Help with exhaust choice

Anyone know what the stock pipe diameter is? I noticed sizes like 2", 2-1/4", 2-1/2" and 3" available.
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post #9 of 17 (permalink) Old Sep 23rd, 05, 12:47 AM
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Re: Help with exhaust choice

I recently replaced the 40 series Flowmasters on my 68 Z28 with the transverse muffler replacement that Flowmaster manufactures. It required some minor pipe fabrication by the muffler shop but the fit was better than average overall. I have retained the cast manifolds, the car sounds great now and has the deep throaty rumble I was looking for. Getting rid of the 40 series mufflers cleaned up the underside of the car big time.
I can still remember the first Z28 I saw (which happened to be a 68), when I was an impressionable 16 year old. The sound of that car all those years ago left such an impression that I knew some day I would own one. It took me 27 years but I finally found and bought the car of my dreams.
Chevrolet advertised the 68 Z28 as the "Closest thing to a Corvett yet". Part of the ad states; "Dual exhausts with 2 1/4 diameter pipes and deep tone mufflers" I don't know where they got the "mufflers" from because it has one transverse unit. Go figure.

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post #10 of 17 (permalink) Old Sep 23rd, 05, 10:16 PM Thread Starter
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Re: Help with exhaust choice

Does the "Rick's" system come with down pipes from the manifolds or is it for headers?
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post #11 of 17 (permalink) Old Sep 23rd, 05, 10:36 PM
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Re: Help with exhaust choice

Ricks system that I have was made for original exhaust manifols and was a perfect bolt in system.

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post #12 of 17 (permalink) Old Sep 24th, 05, 12:23 PM Thread Starter
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Re: Help with exhaust choice

Thanks for all the help, everyone! I'll probably go with the Rick's setup. I live about 1-1/2 hours from them, so I could drive over and save on shipping. Thanks again!
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post #13 of 17 (permalink) Old Sep 24th, 05, 02:31 PM
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Re: Help with exhaust choice

When I ordered my 69 Z in '68, there were two muffler choices.. The stock and the Low restriction, on the order sheet,.. I got the low restriction. The sound was like a stock same year fuelie vette. No rumble and you can hear radio over the 3500 rpm cruising. I don't think that muffler is available thru GM or there may be only one choice now.. I think that Walker still makes the stock transverse but in small pipe sizes. For this reason I went to Flomaster 17104K Kit and it was very raspy, not deep tone as I was accustomed to. So to make it deep tone raspy... I installed two 12" glass round glass pack tubes under the seat area before it goes to the Flomaster transverse. Sounds just as it did some 35 years ago. And I can still hear the radio cruising.

Don
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post #14 of 17 (permalink) Old Sep 24th, 05, 04:17 PM
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Re: Help with exhaust choice

You might also want to look over www.gardnerexhaust.com

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post #15 of 17 (permalink) Old Sep 24th, 05, 04:46 PM
 
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Re: Help with exhaust choice

Anybody out there old enough and still of sound mind to remember its sound!!!



all you old fogies seeing this, Not to start trouble or nothing but. I had a 69 z with the 302 when I was 18 , all original!!! Im only 40. Go with a nice 2.5 inch flowmaster it wont rumble too much and sounds like a jet when you hit it.
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