Make a bigblock quiet...
#1
Member
Thread Starter
Join Date: Mar 2007
Location: Casper, Wyoming
Posts: 205
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1982 Camaro Z28 w/ RS groundfx
Engine: 350
Transmission: Tranzparts 700r4
Axle/Gears: 3.23's
Make a bigblock quiet...
I was looking for a recomendation on some mufflers to make a 454 quiet enough to sound almost as if it was just a stock motor in a thirdgen. Thanks.
#2
Supreme Member
Join Date: Sep 2005
Location: Ottawa, ONT
Posts: 1,951
Likes: 0
Received 7 Likes
on
7 Posts
Car: 1987 Firebird
Engine: 355
Transmission: T56
Re: Make a bigblock quiet...
Im assuming you arent mentioning a few things, but i think youre implying them.
So do you wanna do what youre saying?
Thats easy, put a catalytic conveter, a small y-pipe and a stock muffler behind it
OR
Do you want to make a 454 sound quiet like a stock 305, without hindering performance???
Is budget an issue?
So do you wanna do what youre saying?
Thats easy, put a catalytic conveter, a small y-pipe and a stock muffler behind it
OR
Do you want to make a 454 sound quiet like a stock 305, without hindering performance???
Is budget an issue?
#3
Member
Thread Starter
Join Date: Mar 2007
Location: Casper, Wyoming
Posts: 205
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1982 Camaro Z28 w/ RS groundfx
Engine: 350
Transmission: Tranzparts 700r4
Axle/Gears: 3.23's
Re: Make a bigblock quiet...
Well, lol. I'd like to to make it quiet like a stock 305 and not to sound as if it's any special. But I'd still like to have all the same power i would have with a louder more free flowing exhaust. I don't want to spend an arm and a leg but it needs exhaust either way.
Last edited by blue82_z28; 11-28-2007 at 10:35 PM.
#4
Supreme Member
iTrader: (5)
Join Date: Jan 2002
Location: Orland Park, IL
Posts: 13,619
Likes: 0
Received 3 Likes
on
3 Posts
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: Make a bigblock quiet...
stock bbc manifolds, small y-pipe, a cat and a 3" manaflow exhaust. small duration cam yadda yadda
#5
Senior Member
Join Date: Jul 2007
Location: Manchester, CT + Nashua, NH
Posts: 1,461
Likes: 0
Received 1 Like
on
1 Post
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: Make a bigblock quiet...
If you dont need dual exit tips, this is what I would do. Its pretty obvious that you dont care too much about emissions with a big block, so loose the cat.
I would get a cherry bomb, or another brand glasspack and put it where the cat used to be. 3" or 3.5" single pipe whatever you end up using. It will help dull the sound and eliminate the loud "snap crackle pop" that people like so much in the SLP loudmouth exhausts or similar. These pops will only be turned into "tin" sound in a flowmaster or similar. Plus it will be straight through to minimize restriction.
Next, look at the intermediate pipes for all catback systems. There is a big straight section a few foot long before the axle, that passes under the rear floorpan / rocker. Cut out a section of that, and use a muffler from flo-pro called the "Twister Race Muffler." I have heard this on a car with long tubes and just twisters, and they sound exactly like open headers - but with less decibles. This muffler would reduce the volume of the dulled sound that the glasspack generated. And they are pretty cheap. Moroso also sells a spiral core muffler that is real similar.
Finally, I would run a single exit tip through a flowmaster 50 series big block muffler. This will do the final quieting and tuning of the sound to make it sound like a stock muffler. It is chambered and so is the stock one. Plus it is a 3 chamber design which is mellower than a 40 or 80 series.
I would get a cherry bomb, or another brand glasspack and put it where the cat used to be. 3" or 3.5" single pipe whatever you end up using. It will help dull the sound and eliminate the loud "snap crackle pop" that people like so much in the SLP loudmouth exhausts or similar. These pops will only be turned into "tin" sound in a flowmaster or similar. Plus it will be straight through to minimize restriction.
Next, look at the intermediate pipes for all catback systems. There is a big straight section a few foot long before the axle, that passes under the rear floorpan / rocker. Cut out a section of that, and use a muffler from flo-pro called the "Twister Race Muffler." I have heard this on a car with long tubes and just twisters, and they sound exactly like open headers - but with less decibles. This muffler would reduce the volume of the dulled sound that the glasspack generated. And they are pretty cheap. Moroso also sells a spiral core muffler that is real similar.
Finally, I would run a single exit tip through a flowmaster 50 series big block muffler. This will do the final quieting and tuning of the sound to make it sound like a stock muffler. It is chambered and so is the stock one. Plus it is a 3 chamber design which is mellower than a 40 or 80 series.
Trending Topics
#8
Member
iTrader: (2)
Join Date: Jan 2005
Location: Columbus, In
Posts: 396
Received 0 Likes
on
0 Posts
Car: 87 Camaro
Engine: 406
Transmission: T56
Axle/Gears: 9" ford 35 spline axles
Re: Make a bigblock quiet...
If you dont need dual exit tips, this is what I would do. Its pretty obvious that you dont care too much about emissions with a big block, so loose the cat.
I would get a cherry bomb, or another brand glasspack and put it where the cat used to be. 3" or 3.5" single pipe whatever you end up using. It will help dull the sound and eliminate the loud "snap crackle pop" that people like so much in the SLP loudmouth exhausts or similar. These pops will only be turned into "tin" sound in a flowmaster or similar. Plus it will be straight through to minimize restriction.
Next, look at the intermediate pipes for all catback systems. There is a big straight section a few foot long before the axle, that passes under the rear floorpan / rocker. Cut out a section of that, and use a muffler from flo-pro called the "Twister Race Muffler." I have heard this on a car with long tubes and just twisters, and they sound exactly like open headers - but with less decibles. This muffler would reduce the volume of the dulled sound that the glasspack generated. And they are pretty cheap. Moroso also sells a spiral core muffler that is real similar.
Finally, I would run a single exit tip through a flowmaster 50 series big block muffler. This will do the final quieting and tuning of the sound to make it sound like a stock muffler. It is chambered and so is the stock one. Plus it is a 3 chamber design which is mellower than a 40 or 80 series.
I would get a cherry bomb, or another brand glasspack and put it where the cat used to be. 3" or 3.5" single pipe whatever you end up using. It will help dull the sound and eliminate the loud "snap crackle pop" that people like so much in the SLP loudmouth exhausts or similar. These pops will only be turned into "tin" sound in a flowmaster or similar. Plus it will be straight through to minimize restriction.
Next, look at the intermediate pipes for all catback systems. There is a big straight section a few foot long before the axle, that passes under the rear floorpan / rocker. Cut out a section of that, and use a muffler from flo-pro called the "Twister Race Muffler." I have heard this on a car with long tubes and just twisters, and they sound exactly like open headers - but with less decibles. This muffler would reduce the volume of the dulled sound that the glasspack generated. And they are pretty cheap. Moroso also sells a spiral core muffler that is real similar.
Finally, I would run a single exit tip through a flowmaster 50 series big block muffler. This will do the final quieting and tuning of the sound to make it sound like a stock muffler. It is chambered and so is the stock one. Plus it is a 3 chamber design which is mellower than a 40 or 80 series.
#9
Senior Member
Join Date: Jul 2007
Location: Manchester, CT + Nashua, NH
Posts: 1,461
Likes: 0
Received 1 Like
on
1 Post
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: Make a bigblock quiet...
I have used a glasspack (IMCO brand, not cherry bomb, but they are basically all the same) as a resonator in my last car. It really does help tune out some obnoxious noises. I wouldnt say the glasspack would make it quieter, but it definately would make a difference in the "clicks and pops" category. Another thing was, this was in a 3.1l v6 FWD monte. Having the glasspack actually made the car louder inside. It turns the high pitched raspy sound of straight piped into a lower pitched "drone".
Although, using the twister, or someting else like a Hushpower II will be different. It would actually lower the decibles.
Also, magnaflow makes Roundbody mufflers that are worth looking into. They are the same basis as a straight-thru magnaflow like all their systems use, except the muffler is round and like 4" or 6" in diameter instead of being oval like a 5x9 or something.
Although, using the twister, or someting else like a Hushpower II will be different. It would actually lower the decibles.
Also, magnaflow makes Roundbody mufflers that are worth looking into. They are the same basis as a straight-thru magnaflow like all their systems use, except the muffler is round and like 4" or 6" in diameter instead of being oval like a 5x9 or something.
#10
Member
Thread Starter
Join Date: Mar 2007
Location: Casper, Wyoming
Posts: 205
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1982 Camaro Z28 w/ RS groundfx
Engine: 350
Transmission: Tranzparts 700r4
Axle/Gears: 3.23's
Re: Make a bigblock quiet...
Thanks for the replies. But, I guess what i'm looking for is the sound of a stock 305 just at idle. It doesn't really matter how loud the exhaust is when I slam the pedal down. Would flowmaster 40's work well?
#11
Senior Member
Join Date: Jun 2007
Location: Akron, Ohio
Posts: 600
Likes: 0
Received 0 Likes
on
0 Posts
Car: 87 Suburban 2500
Engine: 455 Wildcat ( somewhat modified ))
Transmission: TH400 ( for now )
Axle/Gears: 4.10 ( for now )
Re: Make a bigblock quiet...
Years ago, they were called resonators.
Essentially nothing more than a second muffler in the system, usually quite close to the end of the tailpipe. Many of the big luxery cars had 'em.
Quick and dirty test.....
Take the second muffler of choice, and temporarily clamp it on the tailpipe.
Don't try and drive anywhwere, but start it up and see how you like the sound.
If you like it, find a spot, cut the pipe, and install it.
Essentially nothing more than a second muffler in the system, usually quite close to the end of the tailpipe. Many of the big luxery cars had 'em.
Quick and dirty test.....
Take the second muffler of choice, and temporarily clamp it on the tailpipe.
Don't try and drive anywhwere, but start it up and see how you like the sound.
If you like it, find a spot, cut the pipe, and install it.
#12
Senior Member
Join Date: Jul 2007
Location: Manchester, CT + Nashua, NH
Posts: 1,461
Likes: 0
Received 1 Like
on
1 Post
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: Make a bigblock quiet...
flowmaster 40's alone are not going to make a big block sound like a stock 305 at idle. It will still sound like a big block.
I have a stock 305. If I were to put a flowmaster 40 or 80 on it, it would not sound quiet at idle. So, your BBC will be alot louder than that.
I think unless you find some kind of stock muffler (like the corvette idea above) and find a way to implement them on an f-body, you are going to need more than one muffler. At least some kind of resonator inline.
I have a stock 305. If I were to put a flowmaster 40 or 80 on it, it would not sound quiet at idle. So, your BBC will be alot louder than that.
I think unless you find some kind of stock muffler (like the corvette idea above) and find a way to implement them on an f-body, you are going to need more than one muffler. At least some kind of resonator inline.
#13
Junior Member
Join Date: Nov 2007
Location: Poland, ME
Posts: 62
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 Z28
Engine: 385
Transmission: T5 (soon to be in pieces)
Axle/Gears: 3.73 POSI Disc
Re: Make a bigblock quiet...
a set of of 180 degree headers will even out the exhaust pulses and make it sound more tame while also producing more top end power
Thread
Thread Starter
Forum
Replies
Last Post
mustangman65_79
Body
3
08-11-2015 03:17 PM