Dual exhaust via stock routing that is.... Well, my system is composed of dual cats. From the cats, dual 2-1/2" pipes run towards the rear, then combine into a 3-inch section of 3-1/2" pipe (crossover, if you will), then immediately split back into a pair of 2-1/2" pipes. They traverse over the axle and to the stock muffler location. From here, I use a pair of polished Stainless Works chambered mufflers, then out through fourth gen Z28 tips. Three pics to follow. Only one muffler can be seen in the first pic:

 

Look beyond the shiny stuff to notice a pair of over-the-axle pipes:

 

And here's a nice shot of both mufflers:

 

wow, that looks great. do you have sound clips?

 

Your car is magic Willie. :hail:

 

Nice job, do you have any sound clips?

 

That does look really good

 

You've got a hell of a muffler shop where you live..........

Very nice looking system. Did the muffler shop that made your track system also bend this one?

 

 

Yea i never seen that exhaust before does it sound good? It looks awesome i like that dual outlet like that also? I want to run duals and those mufflers look like thats the ticket

 

Yeah I want to hear this thing..

 

Dude...
That looks awesome...I'm with everyone else here...I wanna hear it!!!


Tim:rockon:

 

ive heard the chambered exuast on a 35th aniv. edeition camaro that was also hopped up by bergers to give it the 385hp and i have to saw with the chambered exuast it sounds nice as hell.

 

That is a very clean setup, my only question is this, maybe I misunderstood, or didn't see it in the pics.

Did you say you have duals, that go into ONE pipe, then dual again?

 

That looks great...Hard to tell from the pics, how's your ground clearance? I want to hear it too!

 

I appreciate all the compliments. It is a very nice system. Sorry guys, but no sound clip.... yet. I can say its louder and deeper than my previous Flowmaster and 3-inch catback.

The design was taken from the 35th Anniversary Berger SS which used the '69 chambered mufflers. The difference in this system (to mine) is that as you go upstream from the mufflers, the Berger SS merges both pipes into one over-the-axle pipe. Mine retain individuality -- a pair of 2-1/2 inch pipes over-the-axle.

My system uses all mandrel bends too, except for one very slight bend (about 5 degrees) in the driver's side tailpipe -- I ran out of mandrel bends!!

Tom, this is the same shop that built my track exhaust. Also, I came to the realization that with this new system, I won't need my track exhaust any more.

To clarify the question about my system having a single pipe, let's put it another way. I wanted a crossover of some type between the two pipes. Because they run virtually next to each other, it was impossible to use an "X" pipe. So I purchased a pair of Flowmaster "Y's" -- one pair of 2-1/2" to one 3-1/2". One was installed just after the cats. The second was butted up against the first, separating the single 3-1/2" back to a pair of 2-1/2" pipes. I'll have to jack the car up to get a good pic of it. I'll do it soon.

Ground Clearance? It's the same as my previous 3-inch catback. This is the beauty of this true dual exhaust system. It all fits very nicely... and sounds awesome too!!

Willie

 

Gotcha, mind me askin what that ran ya??

I actually like those tips too, I dont care for them on 4th gens, but they look good on your car.

SC z??? man I feel sorry for people on the str that don't know what that stands for, lol.

 

Oh that looks awsome! One of the cleanest systems I've seen. Great job Willie.

Oh, and are those stock 4th gen tips, they are 2 1/2" in? I am planning on using them also.

 

after u went over the axles where did the pipes go? did they stay together or did they split in opp directions?

 

looks great!!

 

Wow, that is quite a cool setup. 12 second 305? Geez, thats awesome. Ever think of putting a 350 in?

 

Nice setup, I gotta come over now and check it out.

Eric

 

WOW. Thats a very clever setup. The first of its kind.

 

Okay guys, here some more info. And answers to some of the questions above.


Cost

Not cheap. But I wanted it done right and was willing to pay the price. First off, the mufflers. Apparently, there are several companies that make chambered mufflers. I went with Stainless Works. I had to go with a custom length, so that was extra. I also had them polished, another "extra". They did give me a cut off their retail though. I paid $134 EACH. I'm sure other companies can make this muffler for cheaper. However, mine have a lifetime guarantee.

I purchased seven 180-degree mandrel bends, comprised of three different radiuses, from Summit and Jegs. Each piece was slightly less than $20 each.

I suppose the crossover would be considered optional, but I bought a pair of Flowmaster "Y's". These were $38 each from Summit.

It took five hours to install the complete system at $60 per hour. I could have gone some place else but I know the guy who did the job is excellent and was willing to pay the price. He's done a lot of work for me in the past.

In retrospect, any "first" will always be expensive. So I'm not surprised at what it cost. Now, if someone were to make a catback system like this...... the cost would definitely be a lot less....


4th Gen Tips

I don't recall for sure the size, but I believe they are 2-1/4", not 2-1/2".


Routing of Pipes

The first of the two over-the-axle pipes makes a very quick 90-degree turn after passing through the hole created by the body and bar (above the Panhard rod). It runs just below the muffler shield to the driver's side, then makes a 180 into the "aft" muffler, then out the passenger side.

The second pipe also makes a 90-degree turn, but it runs directly into the "fore" muffler, then out the driver's side.

So looking from the rear of the car, flow through one muffler is opposite the flow through the other.


350?

Nope. I love running the times I do with "only" a 305. It proves to others that this "displacement challenged" engine can run with the big boys!!

Willie

 

I was going to ask the same, but I figured since you're history buff on these cars, that it was for # matching purposes.

Anyways, that displacement thing isn't real fair is it, with that SC. just messin wit ya.

 

I was going to ask the same, but I figured since you're history buff on these cars, that it was for # matching purposes.

In all honesty, even though I love the stock look, I have no reservations modifying my coupe (as I've done). I retained the 305, not because of originality, but because I wanted to do something different. My original goal was to have a daily-driven, emissions-legal 305 that would run 12's. That means I was looking for a 12.99. Not only have I surpassed my goal, but I'm knocking on 11's.... No complaints from my end!!!

Now my convertible is another story. It will NEVER be modified as it's worth more in original condition.

Anyways, that displacement thing isn't real fair is it, with that SC. just messin wit ya.

Agreed. Just look at 12-second TTA's... 3.8 liters??? Now THAT's amazing!!

Willie

 

So you ran a 12 flat perfectly, don't see that much, man that must have had you itchin for another run... or tryin to get just a tad more boost., lol

 

maybe that new exhaust will knock off .10 and put you in the 11's!!!

 

for that amount of money it better.

 

That's a nice setup, and similar to what I want to do if I ever go to duals (which I probably won't). I have a pic of another setup similar to that, just a different rear section. I'll try and find it when I go home this weekend.

 

Looks good willie. Hey, are you using the NHRAs half correction factor?

 

Not exhaust related but where did you get the brackets ( non serpentine ) for the supercharger?

 

Very nice, dude! I look forward to hearing it soon!

Willie has the single serpentine setup in his '87 Z - he opted to get rid of the '87 rat-maze bracket setup - as did I on my '84!

 

Sorry guys, its been done before
This setup was for sale on here awhile back but I forget what they wanted for it. I must say I still like Willie's rear section a lot better. I'm not sure this would sound that great with no mufflers.

 

The major difference between that system and Willie's is that Willie's has functioning cats and mufflers.

 

You noticed that too. LOL.

 

Thats what the the system on my camaro looked like except it wasent coated and had glasspacks before the tips.

 

DO MINE NEXT!!!

 

Guys, I was lucky enough to hear it today. Let me tell you, it is LOUD when he opens it up! It looks even better in person.

 

DAMN now I really want to hear a sound clip!!!!

 

Damn AZ guys, why don't you all move out east.

 

why don't you admit that to dynomax or something. they could give you money for the design and then sell it to us for decent price.

 

Any sound clips of your previous exhaust to compare against the new once you post them??

 

Could you get any pics of the system after the headers but before the rear showing routing, etc? Thanks!! Looks awesome!!!

 

i live in az. i wanna hear it

 

willie, what kinda of lower control arms are you running there? are they adjustable?

 

They look like the Lakewood Lift Bars...

 

willie, what kinda of lower control arms are you running there? are they adjustable?

 

They are the Lakewood lift bars.

Willie

 

hey willie! i saw your car today at super chevy, and saw you get your award, its sweet lookin i wouldve said hi but until i saw you get your award i didnt know what you looked like...