My exhaust is too loud - how to make quieter?

[mickmate]

Make them 2-1/2" x 24" with the louvres facing the motor.
Classic Chambered Exhaust Inc. - Products The 2524's

[patrickt]

Gary, I think the absolute truth of the matter is you're going to have to get new pipes made. I have the Stainless Specialties "quieter pipes" and they do pretty well. Short of new pipes, everything else is a just a gimmick.

[Jeff Frigo]

Originally Posted by patrickt

Gary, I think the absolute truth of the matter is you're going to have to get new pipes made. I have the Stainless Specialties "quieter pipes" and they do pretty well. Short of new pipes, everything else is a just a gimmick.

I have talked to guys in who race A Production cars (see below) in vintage races that swear that these work well with little to no loss in power.

Dynatech Accessories - Auger Style Muffler



A-Production

AC Cobra (427cid)
1970-72 Chevrolet Corvette 350cid
1965-67 Chevrolet Corvette 427cid
1968-72 Chevrolet Corvette 427/454cid
DeTomaso Pantera 351cid
Ford Boss 429 429cid
Shelby GT-500 428cid

[patrickt]

Originally Posted by Jeff Frigo

I have talked to guys in who race A Production cars (see below) in vintage races that swear that these work well with little to no loss in power.

Dynatech Accessories - Auger Style Muffler

I've heard that too. But there have also been threads on here where guys have tried them and said just the opposite. I also suspect that the psychological force of "believing they work," after you've gone to the trouble of buying and installing them, might also come in to play. I know I had been around more than one Cobra that just plain hurt my ears (from both outside the car, and inside) so I dealt with the issue when SS was fabbing the pipes. I really like their "quieter pipes" on my FE, but it's going to cost him a couple of bucks. On the other hand the auger inserts are only $15, so WTF, he might as well give it a shot I suppose.

[Dwight]

I replaced my 2 1/2" x 24" mufflers (louvers facing away from motor) with Classic 3" x 28" (louvers facing the motor). They are a lot quieter and still sound like a Cobra, deep rumble at idle.

Dwight

[Jeff Frigo]

Originally Posted by patrickt

I've heard that too. But there have also been threads on here where guys have tried them and said just the opposite. I also suspect that the psychological force of "believing they work," after you've gone to the trouble of buying and installing them, might also come in to play. I know I had been around more than one Cobra that just plain hurt my ears (from both outside the car, and inside) so I dealt with the issue when SS was fabbing the pipes. I really like their "quieter pipes" on my FE, but it's going to cost him a couple of bucks. On the other hand the auger inserts are only $15, so WTF, he might as well give it a shot I suppose.

Patrickt:

I have not been able to find anybody on the forum that has tried them. I have searched. Do you think you could find that thread. I was planning on trying them this winter, but if they are NG, I would like to save my money. $15.00 is no biggy, but the rest of the process for existing ceramic coated pipes are.

[undy]

I had the "auger" style mufflers on my ride and picked up 40 rwhp (and a small amount of noise) when I went to the Classic Chambered exhaust. There's just too much exhaust impingement with the spiral style...

[Jeff Frigo]

Originally Posted by undy

I had the "auger" style mufflers on my ride and picked up 40 rwhp (and a small amount of noise) when I went to the Classic Chambered exhaust. There's just too much exhaust impingement with the spiral style...

What was the hp diff with the chambered? Pleases explain exhaust impingement.

[ACademic]

Originally Posted by mickmate

Make them 2-1/2" x 24" with the louvres facing the motor.
Classic Chambered Exhaust Inc. - Products The 2524's

Mickmate, you have a lot of experience with the Classic Chambered. I'm running the 3" (louvers facing the motor) on a 22" case and they sound great at idle but sound "less Cobra-like" on moderate/hard acceleration. In your opinion does your suggestion above get the overall sound back to that classic Cobra gurgle throughout the rpm range? It's really hard finding well-prepared sound clips on some of these options.