Exhausts and mufflers

[1974vette]

I just had my new dual exhausts made and installed on my Vette yesterday. I am now running Flowmaster 40 series mufflers and boy do they sound great! I am ready to get my interior finished so I can drive the vette more often. I was just wondering, what all are you guys (and girls) running on your vettes?

-Matt

 

[78SilvAnniv]

MA SS dual chambered exhaust (no cats, no mufflers, no cross or H pipe)

Sounds schweeet!
My gas mileage suffers because I can't keep my foot out of the loud pedal.
Heidi :W

 

[Bob Chadwick]

Delta 50's. Not as loud but still sounds good.

 

[Crickett]

Right now I'm runnin Delta 40s too, but I have my standard 2-1-2 exhaust.....for now. :t

 

[JrdnsEdu]

Just put on Delta 40's also with 2 1/4 pipes instead of 2. I think it sounds grrrrrrrrrreat!!! I was going for 50's and I could not be happier that they were to long.

 

[Dave L.]

Stainless steel Mid-America duals with Flowmaster 40's.....extremely pleased with sound and performance.

Dave

 

[1974vette]

im glad to hear that nobody has the exhaust tip with the LEDs like the ol ricer boys!

 

[Crickett]

 

[Macgyver]

BobChad that link is just what I wsa looking for! That idle sounds pretty tough.

How do the Delta40's compare as far as sound? Are they a deeper tone or much louder?

 

[pauld]

I am fitting MA true dual 2 1/2" stainless steel system with standard mufflers. Can't wait to hear and feel the results!

 

[Bob Chadwick]

BobChad that link is just what I wsa looking for! That idle sounds pretty tough.

How do the Delta40's compare as far as sound? Are they a deeper tone or much louder?

The 50 series is supposed to be quiter than the 40's and the Delta's a little quieter than the standard muffler.

 

[Roy]

Getting New Exhaust System + Question

I plan to have a complete dual exhaust system installed this Thursday ... dual cats, dual mufflers and initially no crossover, or "H" pipe. The fellow that is installing the system suggests that I try the dual exhausts without the crossover pipe and if I don't like the sound, he will simply add the crossover pipe.

Question #1: Does anyone have feedback + or - regarding crossover connector pipes between the dual exhaust pipes?

The installer suggested 2 1/4" diameter aluminized pipe. I thought that 2 1/2 might be better to try.

Question #2: Should I use 2 1/4" or 2 1/2" diameter exhaust pipe?

The engine is a new 330 HP 350 V-8 with Hedman "Tight Tube" headers.

Any input would be greatly appreciated.

By the way, for the hand built system, all welded (no clamps), high quality mufflers and cats from this highly recommended individual, all parts and labor = $550 here in sunny Portland, Oregon. I don't know what other parts of the country are charging but thought I would share the info.

 

[Stallion]

For later years like mine (I can't remember if '75 was the last year of dual, or the first year of no dual), how hard would it be to convert? I mean, on our frame cross-bar where the exaust would go through, there wouldn't be room. Right?

How would that work?

 

[78SilvAnniv]

Actually...

...how hard would it be to convert? I mean, on our frame cross-bar where the exaust would go through, there wouldn't be room. Right?

There is plenty of room.
I have had duals installed on my 78 with no modification to the frame.
If your cross member (the part that goes under the rear part of the tranny) has two holes, you have places for each exhaust pipe of a dual system to pass through.

The vettes that have problems are the ones that only have a single hole for the exhaust pipe/s to pass through the cross member and these systems are 2-1-2 and cannot be changed to true duals without changing the cross member.
Heidi

 

[pauld]

Heidi,

Mid America Designs supply a true dual system to fit to the cars with only one hole in the cross member, for years 80-82. I have it fitted on my '81 and it fits a treat with no cross member changes or modifications. I am very pleased with the results.

 

[78SilvAnniv]

Does MAD have a picture of it in their catalog?

I would think they could not get two pipes to fit through one cross member hole! Is that how it is done? Surely they don't go UNDER the cross member!?
I'll be checking my MAD catalog to see what I can see!
Heidi (learns something new everyday!)

 

[Roy]

Diameter - Tone - Mileage Questions

Heidi,

What diameter pipe are you running through the frame cutouts? Will 2 1/2" diameter pipe fit and provide sufficient clearance in these openings?

Thank you.

By the way, what is the differance in exhaust tone without the connector pipe? Is it more raspey(sp), deeper or something else.

Has anyone measured their gas mileage before and after exhaust system conversions?

 

[78SilvAnniv]

Just measured...

This is probably in-exact, but where my chambered exhaust passes through the 3.5" openings in the cross members, the pipes narrow to about 2.25" diameter. Elsewhere, the pipes are about 2.5" and in the chambered sections the pipes are as wide as 3".
*This would be a judgement call for you regarding 2.5" pipe through the cross member.

I don't know about with/without the connector pipe, but I think that would cut down dramatically on 'popping' when I let off to slow down, downshift or brake from hwy speeds.
Overall, the chambered system is so much louder, deeper, muscle-y sounding than my stock 2-1-2 system...I love it!

Gas mileage. :L
Yeah, mine has suffered greatly. I fear this is mostly because I cannot keep my foot out of the loud pedal because I like listening to it. IF I were driving as I did before the loud exhaust, I think my difference in gas mileage would be minimal.
Heidi

 

[Roy]

"Chambered" Exhaust?

Heidi,

What do you mean by a "chambered" exhaust?

Thank you.

 

[78SilvAnniv]

The chambered exhaust sytem has no mufflers. Instead, there is a section of pipe with another pipe inside (baffle?) that the outer pipe is crimped around. That was not a good explanation, but when I recieved the pieces I could look through the pipe sections and see LOTS of garage floor! :eek Definitely free-flowing!
I will try to resize one of my pics and attach it in this thread shortly.
Heidi