Any HP gain from free-flowing muffler?
#1
Any HP gain from free-flowing muffler?
Well I'm sure in theory there is, but I was just wondering if a free-flowing muffler will give the same effect as an aftermarket cat-back. I know the stock pipes themselves are already in good shape, decent size, good bends, so going with a less restrictive muffler should do good over stock right? I was just curious if the muffler swap I did a while back (primarily for change in sound) has benefited at all. Dyno #s and whatnot are in the sig, and that's with all the mods listed.
Nate
Nate
#3
What about cat-backs then? They worth it? I was thinking of just keeping the muffler for the nice sound, but get an elec. cutout when I do headers this year. What do you think? Is it just more preference?
Nate
Nate
#4
For exhaust to really do anything you'll need pipes. The stock 2.75" press bent pipes aren't exactly the best. Getting mandrel 3" pipes will make it sound better as well as perform better. Then get headers and a new y-pipe and it'll be even better.
#5
The factory pipes are 2.75" and they are mandrel bends not compression. The most restriction is in the muffler. Lots of people gaining 8-10 ponys with just adding a muffler. Even people getting 6h.p. with just the so called bad flowing flowmaster muffler.
Jason
Jason
#6
Originally posted by LT1
The factory pipes are 2.75" and they are mandrel bends not compression. The most restriction is in the muffler. Lots of people gaining 8-10 ponys with just adding a muffler. Even people getting 6h.p. with just the so called bad flowing flowmaster muffler.
Jason
The factory pipes are 2.75" and they are mandrel bends not compression. The most restriction is in the muffler. Lots of people gaining 8-10 ponys with just adding a muffler. Even people getting 6h.p. with just the so called bad flowing flowmaster muffler.
Jason
#7
take a look at my dyno:
thats with just having my "dynomouth" exhaust, which is just a bullet muffler #24222 ($35). I gained 15RWHP on the dyno(you can see the comparison...and thats dynoing after a few WOT runs)...and its one of the cleanest sounding exhausts on an LS1 (no rasp or much drone). Here is the diagram on how its setup
and btw, flowmaster has the crappiest flows. im also using my stock tips
thats with just having my "dynomouth" exhaust, which is just a bullet muffler #24222 ($35). I gained 15RWHP on the dyno(you can see the comparison...and thats dynoing after a few WOT runs)...and its one of the cleanest sounding exhausts on an LS1 (no rasp or much drone). Here is the diagram on how its setup
and btw, flowmaster has the crappiest flows. im also using my stock tips
#8
I personally don't know how much of an increase I gained from the Dynomouth Exhaust but I do know that you can feel it as well as hear it.. My 02 Z is an A4 w/ 2.73, w/ stock muffler you could get the rear wheels to burn by putting the tranny in 1st gear and floor it otherwise it would spin a little and then when tranny shifted, the wheels would stop spinning... Now w/ DM, leave it in O/D or even D and Floor it, damn wheels will spin untill it shifts into Overdrive.... But that is proof enough to me, that w/ 2.73 gear ratio and spins like crazy, shows that I have more rwhp...
Plus how can 2 and 3/4 " flow that much less then 3".. I can see 2" not flowing as well as 3"... This is my opinion... Now on the otherhand upgrading the Y-pipe will flow since the stock one is Flat in one area....
But I have read somewhere that LM versus DM (where DM is on stock I-pipe) flows the same and even when converting LM to DM (replacing resonator w/ Dynomax Bullet Muffler), flows the same as well... So I just cannot see how there is much of a difference for flow... Sound might be better on 3" but not too much to tell the difference...
charlie
Plus how can 2 and 3/4 " flow that much less then 3".. I can see 2" not flowing as well as 3"... This is my opinion... Now on the otherhand upgrading the Y-pipe will flow since the stock one is Flat in one area....
But I have read somewhere that LM versus DM (where DM is on stock I-pipe) flows the same and even when converting LM to DM (replacing resonator w/ Dynomax Bullet Muffler), flows the same as well... So I just cannot see how there is much of a difference for flow... Sound might be better on 3" but not too much to tell the difference...
charlie
#9
Originally posted by dmnall
how can 2 and 3/4 " flow that much less then 3". Now on the otherhand upgrading the Y-pipe will flow since the stock one is Flat in one area.
how can 2 and 3/4 " flow that much less then 3". Now on the otherhand upgrading the Y-pipe will flow since the stock one is Flat in one area.
The stock pipes are mandrel bent that has been the case on both my Camaros.But still I cut them out to put larger tubing in.Thats when I SAW the Mandrel bends.
where are you RS Drag going to find free flowing muffler with dual outlets thats other then ones used in catbacks? If your thinking of just one tail pipe and Dyno. or Magna. replacing the stock dual outlet on your 2.75". Yeah it would be better then stock.And can compare to an aftermarket catback flow in which most of them right at the end of the line take flow and split it to duals(somewhat slow it/restrict).So in theory if you get the free flow single in/out straight thru design it'll evacuate exhaust gases quicker moving ABOUT the same volume by velocity verses a 3" catback.IMO
#10
I think most of the gain you would have gotten from a catback would have come from the muffler. If the Dynomax muffler you have is the straight through design one, I wouldn't get a new catback until you're making a lot of horsepower. If you really want to upgrade your i-pipe and tailpipes, Dynomax sells those pieces alone for pretty cheap.
#11
3 IN.?
290 rwhp is not enough to make 3 inches work for you. 2.75" is fine. the muffler is what you needed. if you just take off the muffler, your car will sound like a truck. some people like that, but i don't think you will get the sound you want.
i recommend a dynomax muff for greatest increase in hp and flowmaster for best sound. magna flow has some of both.
-J-
i recommend a dynomax muff for greatest increase in hp and flowmaster for best sound. magna flow has some of both.
-J-
#12
Re: 3 IN.?
Originally posted by EyE_RawK_ZeeE
magna flow has some of both.-J-
magna flow has some of both.-J-
The flowmasters WELL may have good sound I'm more performance minded.As far as the flow I dont really know...But I have seen the cross section views of them and its pretty cluttered even have dead end spots.These walls and chambers harmonically make the good sound at the same time destroy the flow.
#13
Originally posted by #7
2.75" does flow less but not that much as you think.I figure 3" flows a little less then 10% more exhaust volume than 2.75". 10% is more though,I imagine velocity and intake air play major roles in the benifit of 3" over 2.75".
The stock pipes are mandrel bent that has been the case on both my Camaros.But still I cut them out to put larger tubing in.Thats when I SAW the Mandrel bends.
2.75" does flow less but not that much as you think.I figure 3" flows a little less then 10% more exhaust volume than 2.75". 10% is more though,I imagine velocity and intake air play major roles in the benifit of 3" over 2.75".
The stock pipes are mandrel bent that has been the case on both my Camaros.But still I cut them out to put larger tubing in.Thats when I SAW the Mandrel bends.
Thread
Thread Starter
Forum
Replies
Last Post
GusarskiSS
Exhaust System
1
09-02-2015 03:51 PM