Muffler/Exhuast question....

[moliva1568]

The 40/50/70 series by flowmaster. Any idea which one will give me a nice rich sound without being too loud? Loud meaning obnoxious outside and droning out the ability to have a normal conversation inside. The charts obviously point to the 70 series but i'd like to know if anybody can say from their own personal experience which they feel is better. I don't want to sound like a race car but a nice aggresive tone is what i would like. The car is a 1984 305 caprice classic and it would be a dual set up.

(Any idea what the costs associated with having this set up would be? Should I buy the mufflers separate and then take it to a muffler shop?)

[j cAT]

Originally Posted by moliva1568

The 40/50/70 series by flowmaster. Any idea which one will give me a nice rich sound without being too loud? Loud meaning obnoxious outside and droning out the ability to have a normal conversation inside. The charts obviously point to the 70 series but i'd like to know if anybody can say from their own personal experience which they feel is better. I don't want to sound like a race car but a nice aggresive tone is what i would like. The car is a 1984 305 caprice classic and it would be a dual set up.

(Any idea what the costs associated with having this set up would be? Should I buy the mufflers separate and then take it to a muffler shop?)

since this is for a sound desired,,, I would consult with the muffler shop first..

[mike561]

I have the 40 series, when the engine is cold and at high idle it can be kinda loud though, i have the same motor as you but no cats. after the engine is warm and at normal low idle its a nice tame dull rumble. its kinda loud on the interior but not to where you have to yell. i may get some sound buffering material, or just upgrade to the 70 series

[bhw33191]

Im running a flowmaster 50..i think it sounds great. it was made to be loud(er) on the outside and less on the inside according to the site. Its a single exhaust, but i'm happy with it.

Heres my youtube video on the before and after:

http://www.youtube.com/watch?v=u_XoeoA14QM

[Blt2Lst]

I have the 50 series on mine. Quiet on the inside (a little louder than stock), a little louder on the outside..

[mike561]

Also, does anyone know of whats good to use to deaden the sound more for the interior? i need something heat and weatherproof of course since its going under the car near the exhaust pipes...

[NOVAZ27]

MIKE561 check out the powerblock series of automotive shows MUSCLECAR, TRUCKS ETC. Their website has a lot of information for products like this. Just last week's epidode of Musclecar they were putting some heat/sound shield into the interior of a "70s" mopar. For the life of me i cannot remember the name of the product, senior moment here. Use the internet see what you come up with. Hope your state's smog laws allow the exhaust mods that you are considering.

NOVAZ27

[j cAT]

Originally Posted by mike561

Also, does anyone know of whats good to use to deaden the sound more for the interior? i need something heat and weatherproof of course since its going under the car near the exhaust pipes...

to reduce the noise from outside the vehicle you double up on the under carpet padding....including up where your feet go including also the trunk area,,,,,as an added bonus the a/c ,,,heat of the interior is better...

the exhaust mufflers should have s/steel shields installed to reduce heat/noise from entering the interior ...they should be a few inches larger than the muffler and fastened to the car body...

the use of rustproofing compound 2-3 coats on the exterior will also increase the reduction of exterior sound...RUSFRE IS A BRUSH ON PRODUCT THAT WORKS WELL...

[mike561]

that Rusfre stuff looks interesting, i might give that a try

[Blt2Lst]

Originally Posted by mike561

Also, does anyone know of whats good to use to deaden the sound more for the interior? i need something heat and weatherproof of course since its going under the car near the exhaust pipes...

Dynamat is what you are looking for, it goes under the carpet and attaches directly to the floor.

http://www.dynamat.com/

[deesandvees]

When I got my dual setup I asked the guy for 3 chamber Flowmasters. That's what I'm used to calling them, 3 or 2. Don't know what that matches up to with the 40/50/70 (anybody know?). 2 chamber would have been too loud for me. The 3 is nice cause it still turns heads when I get on it but my neighbors aren't alerted every time I come home either. Nice rumble at idle, too. If I had a 68 Caprice (my other favorite Caprice) I'd get the 2 chambers.
Also if you're running duals I'd recommend doing some work to the crossmember. I had the exhaust shop weld together (extra $100 on top of exhaust charges) both right sides of a 700r4 crossmember and a 200r4 crossmember (I've got a 700r4). You can see the weld in this pic. That makes for dual humps for a cleaner pipe install.

[moliva1568]

thanks for all the input. I think i'm gonna go with the 50 series on mine. (it is a three chamber) when i had my ram i put a dual exhaust bolt on from gibson. that kit had 1 muffler and then two exiting pipes. for my caprice, i would have to change the catalytic converter set up, correct? will this keep the car from passing inspection in NY? they don't do emission on 25+ year cars from what i can see so maybe it won't matter.

the benefits of a true dual exhaust relate to strictly power/performance gains or will the overall engine life/care be better as well? I have no intentions of trying to push more power from my car. I just love the model design period. With that being said, I want to get the dual exhaust look and sound but do so without breaking the bank. what would be the most cost effective way to achieve that? i haven't put a limit on how much i'm willing to spend but if i can achieve this by spending $400-500 instead of $1000, that is my goal. keep in mind that i'm not mechanically inclined at all so the entire process would have to be done at a shop which would add labor costs.

What did that set-up cost you dees&vees if you don't mind me asking?

[Blt2Lst]

Originally Posted by deesandvees

When I got my dual setup I asked the guy for 3 chamber Flowmasters. That's what I'm used to calling them, 3 or 2. Don't know what that matches up to with the 40/50/70 (anybody know?). 2 chamber would have been too loud for me. The 3 is nice cause it still turns heads when I get on it but my neighbors aren't alerted every time I come home either. Nice rumble at idle, too. If I had a 68 Caprice (my other favorite Caprice) I'd get the 2 chambers.
Also if you're running duals I'd recommend doing some work to the crossmember. I had the exhaust shop weld together (extra $100 on top of exhaust charges) both right sides of a 700r4 crossmember and a 200r4 crossmember (I've got a 700r4). You can see the weld in this pic. That makes for dual humps for a cleaner pipe install.

Just curious, how did you get that exhaust by the smog cops on your 87 in socal ?
I would love a set-up like yours on my 89 but the smog police would not approve.

[deesandvees]

Originally Posted by moliva1568

What did that set-up cost you dees&vees if you don't mind me asking?

$700, about 9 months ago, you could probably even get a better deal nowadays.

[deesandvees]

Originally Posted by Blt2Lst

Just curious, how did you get that exhaust by the smog cops on your 87 in socal ?

Not in CA no more. Good luck down there.