Exhaust Questions

[parkercoman]

i have a 1991 convertible and I was looking at my mufflers and notice that they only have one true outlet.
Question 1: What the heck would happen if someone was to drill out the second or dummy outlet?

Question 2: Would this just make it louder or give it better performance?

Question 3: My Last C4 I put muffler eliminators on it and the sound inside the car was just to much Would it happen if you drilled the muffler out?

Just seems like a simply way to get more from a beautiful car.


Chris

 

[vetteoz]

Question 1: What the heck would happen if someone was to drill out the second or dummy outlet?

Some of the early cars came with both holes working ; factory rated them +5 Hp extra ;squint:

 

[G Winter]

If it is to loud drilled out you can always drive some kind of plug into it.

Glenn

 

[parkercoman]

I cant believe no one has done this yet

 

[Schrade]

Air limitation on an L98 is on the intake; not the exhaust.

The intake design is based on flow characteristics of a TPI 305 LB9, not a TPI 350 L98. Unless you have some fouling/plugging in the exhaust, it probably won't show too much power increase.



















(not like one of these, anyway )

 

[vetteoz]

I cant believe no one has done this yet

The stock truck mufflers are so restrictive most people with performance in mind just replace them.

 

[bucket]

The stock truck mufflers are so restrictive most people with performance in mind just replace them.

and heavy...
can i just get glass packs welded in instead.?
or cherry bombs.?
lol

 

[gmjunkie]

i have a 1991 convertible and I was looking at my mufflers and notice that they only have one true outlet.
Question 1: What the heck would happen if someone was to drill out the second or dummy outlet?

Question 2: Would this just make it louder or give it better performance?

Question 3: My Last C4 I put muffler eliminators on it and the sound inside the car was just to much Would it happen if you drilled the muffler out?

Just seems like a simply way to get more from a beautiful car.


Chris

I've got a buddy that does some really Nice Custom Stainless work!!
This is a 90 vert that he done,It's Purdy!!!

The Old............................

The New!!

 

[bucket]

I've got a buddy that does some really Nice Custom Stainless work!!
This is a 90 vert that he done,It's Purdy!!!

The Old............................

The New!!

i wonder if i could get one like that with a valve on the left side to shut it off....they always stick the smog probe up the left exhaust pipe....lol

 

[G Winter]

There are electric control valves available. Would need to weld in a couple flanges.

Junk, could you line up that guy to do some work for me ?


Glenn

 

[gmjunkie]

Junk, could you line up that guy to do some work for me ?


Glenn

Probly so Glenn,he lives in your neck of the woods and has a Red 90 Vert just exactly like yours!! I mean Exactly!!!

 

[bucket]

what kind of mufflers are those.?

 

[gmjunkie]

what kind of mufflers are those.?

GW Stainless!

 

[G Winter]

Custom built my me. One of those is now on my 95 GMC.The other decided I didn't do a good enough job of clamping it and went for a wild ride down the road somewhere.I was going to replace them so didn't bother with going back. Since then have replaced them twice . Finally achieved a muffler that works for me.When I get my hands on a video camera I will be posting on U Tube, or Vette tube. I have a nice deep tone without being to loud.

Glenn


BTW the pipes and mufflers I have now may get sold later this fall. Planning on another build just a little diff.

 

[bucket]

Custom built my me. One of those is now on my 95 GMC.The other decided I didn't do a good enough job of clamping it and went for a wild ride down the road somewhere.I was going to replace them so didn't bother with going back. Since then have replaced them twice . Finally achieved a muffler that works for me.When I get my hands on a video camera I will be posting on U Tube, or Vette tube. I have a nice deep tone without being to loud.

Glenn


BTW the pipes and mufflers I have now may get sold later this fall. Planning on another build just a little diff.

ok then...you be a weldarr eh..?
so i reckon this muffler is mostly can a less muffle...

 

[G Winter]

Yes I can weld some but actually work as a machinist.
I built the first mufflers round with baffles that split the exhaust then directed it back to the middle , repeating this about three times . It took the crack out but not the sound quality I wanted. The second set I built oval with just a front to rear on one side then back to the front in the middle and to the back on the other side and out.Where it turned I had perforated steal with fiberglass behind it. This was better but still not quite the result I wanted.
the final set I built the same way but wrapped in perforated, then a tight wrap of fiberglass and an outside jacket. This pretty much gave me the result I wanted. The pipes are 3 in OD stainless.

So nope , not just a can. Don't need an echo chamber.

Glenn

 

[ZumZum]

i have a 1991 convertible and I was looking at my mufflers and notice that they only have one true outlet.
Question 1: What the heck would happen if someone was to drill out the second or dummy outlet?

Question 2: Would this just make it louder or give it better performance?

Question 3: My Last C4 I put muffler eliminators on it and the sound inside the car was just to much Would it happen if you drilled the muffler out?

Just seems like a simply way to get more from a beautiful car.


Chris

I thought the verts came with the factory exhaust with 2 working outlets.

 

[Topless]

Glenn-
Ever check the flow of your mufflers? Oh and nice to see that I am not the only one running a custom 3" system.

 

[G Winter]

Glenn-
Ever check the flow of your mufflers? Oh and nice to see that I am not the only one running a custom 3" system.

I haven't yet. I plan on welding a fitting on to do that in the future. I might actually have a fair amount of back pressure, but not like the stocks.
The 3 in from cat back with straight pipes is actually quieter than the stock pipes with straight pipes in place of mufflers.
But either way the straight pipes are way to loud..
They are 3 in because that is what was available, for 10 cents a lb.

Glenn

 

[Topless]

I haven't yet. I plan on welding a fitting on to do that in the future. I might actually have a fair amount of back pressure, but not like the stocks.
The 3 in from cat back with straight pipes is actually quieter than the stock pipes with straight pipes in place of mufflers.
But either way the straight pipes are way to loud..
They are 3 in because that is what was available, for 10 cents a lb.

Glenn

I have straight pipes, and it is loud on the inside. But it sounds so good on the outside at WOT!