Quiet High Flow Exhaust??
Thread Starter
Pro
Joined: Feb 2001
Posts: 604
Likes: 0
From: Corona CA
Quiet High Flow Exhaust??
I'm wondering if there is a low back pressure exhaust system, that isn't so loud my ears want to run away and die. I have dual flow masters and the internal resonance is killer. I know I've asked this question before, but maybe something new came out.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by 93 ragtop
Have you considered converting over to a stock LT1 system.
They're readily available for little or nothing here on the forum. I made very respectable dyno numbers using a stock system, with headers. It sounds great when I nail it too, with a modified engine. You can hear it, but could drive it to church too, w/o raising an eyebrow.
Melting Slicks
Joined: Dec 2001
Posts: 2,049
Likes: 0
From: Texas
I know that there's only about 2 people on this board that had the same results as me, but my Tri-Flo 3" was QUIET as hell when I got it. Slightly louder than stock but really really quiet. I ended up taking the resonator off to get the loudness I wanted. All though sound was great, it wasn't as loud as I had hoped.
(btw, I have the resonator if you're piecing an exhaust together rather than cat-back, hit me up if you're interested)
(btw, I have the resonator if you're piecing an exhaust together rather than cat-back, hit me up if you're interested)
Heel & Toe
Joined: May 2002
Posts: 17
Likes: 0
From: Monroe la
I have a L98 with long tube headers, a crossover pipe, no cat, and 3 chamber Flowmasters. It was entirely too loud. Resonance killed me. I added two straight through glass packs where the cat was and that did the job. Very mellow quiet but has minimal back prssure. I haven't had a cat for 12 years so I don't know what Flowmasters sound like with cat but I would guess it would pretty loud.
Racer
Joined: Mar 2004
Posts: 311
Likes: 0
From: Oakley Ca
Plug one of the outlet pipes on the flowmasters and it will help quiet the resonance. Yeh I know I'll catch flack, but thats what I did. Didn't make any noticable difference at the track once when I forgot to unplug 'em. Seems like I used some black plastic plumbing plugs. No, they didn't melt either! and weren't too noticable. OK, let me have it.
Burning Brakes
Joined: Nov 2003
Posts: 935
Likes: 2
From: Beverly, NJ
Originally Posted by olman
Plug one of the outlet pipes on the flowmasters and it will help quiet the resonance. Yeh I know I'll catch flack, but thats what I did. Didn't make any noticable difference at the track once when I forgot to unplug 'em. Seems like I used some black plastic plumbing plugs. No, they didn't melt either! and weren't too noticable. OK, let me have it.
I got rid of my stock mufflers mainly because I thought it looked so stupid with exhaust only coming out of one tailpipe on each muffler when I have two tail pipes on each. That is so fake. So I threw on Magnaflow. I too was thinking of flowmasters in the beginning, because I wanted loud exhaust, OUTSIDE the car. But once I heard that it is terrible on the inside, I chose Magnaflow. I would have used Corsa if they would fit on my 86. The magnaflows are still a bit loud too, but I kinda like it. I mostly drive the car by myself anyways, so nobody has to deal with it but me.
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Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
I would think that they would hang at the normal height since they are both c-4. The mufflers are big and some people dont like them for that reason. Just look at a LT1 car and decide. Now you will need the LT1 hangers.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by Vett-eight-nine
The LT1 mufflers have the square tips?
How much do they flow?
How much do they flow?
Last edited by Corvette Kid; Dec 14, 2004 at 04:55 PM.
Le Mans Master
Joined: Feb 1999
Posts: 6,172
Likes: 11
From: somers, ny
I've got a stock LT1 exhaust on my car, and it's nice and quiet. However, I think it is costing me about 3 tenths and 3 mph at the track, but my combo really calls for a larger exhaust. I would think on something closer to stock it wouldn't be all that restrictive. the pipes are 2 3/4 inch, which is rather large and also kinda hard to get parts for. I put the stock exhaust on as a temporary fix, but got used to the quiet and dont want to take it off just yet.
Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by ralph
I've got a stock LT1 exhaust on my car, and it's nice and quiet. However, I think it is costing me about 3 tenths and 3 mph at the track, but my combo really calls for a larger exhaust. I would think on something closer to stock it wouldn't be all that restrictive. the pipes are 2 3/4 inch, which is rather large and also kinda hard to get parts for. I put the stock exhaust on as a temporary fix, but got used to the quiet and dont want to take it off just yet.
Pro
Joined: Jan 2004
Posts: 565
Likes: 0
From: Toronto ON
Mine wouldn't be putting out more than 300CHP.
Reason I ask is because there's a gm muffler on ebay for a 90, 91. Were the mufflers turbo from the factory? The seller only has r.s. and can't give me any more specs!
Reason I ask is because there's a gm muffler on ebay for a 90, 91. Were the mufflers turbo from the factory? The seller only has r.s. and can't give me any more specs!
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by Vett-eight-nine
Mine wouldn't be putting out more than 300CHP.
Reason I ask is because there's a gm muffler on ebay for a 90, 91. Were the mufflers turbo from the factory? The seller only has r.s. and can't give me any more specs!
Reason I ask is because there's a gm muffler on ebay for a 90, 91. Were the mufflers turbo from the factory? The seller only has r.s. and can't give me any more specs!
Le Mans Master
Joined: Feb 1999
Posts: 6,172
Likes: 11
From: somers, ny
Originally Posted by Corvette Kid NC
Yeah, with your thumper, it probably is hurting you a bit. But modify that system w/ a 3" X pipe and muffs and you'd be fine while saving a bunch of money!
I think you're right, but i don't want it to be too loud either. I used to plug one of the outlet pipes (as mentioned above) on my 350 with borlas. It used to quiet it down a lot and then i could remove the plugs at the track. I still have the cat back from the 350, but it doen't look like the borlas would be an easy swap. they are 2 1/2" and the elbow is not at the proper angle to match the LT1 setup. I'll probaly just the sell the borla cat back and do exactly what you suggested. My guess is the stock mufferes are much more restrictive than the resonator. they only have a 2 1/4 inlet and are not straight thru. So i'll probably do mufflers first and then maybe the x-pipe depending on noise level.
Burning Brakes
Joined: Nov 2002
Posts: 1,239
Likes: 1
From: Las Vegas NV
Originally Posted by 93 ragtop
Have you considered converting over to a stock LT1 system.
I am installing Hooker LTs in a couple weeks and I am keeping the stock LT1 mufflers because they are quiet and I like the look. I am ditching the cats & resonator though. It will be interesting to see how it sounds. I will never use Flowmaster again, to much resonance.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by ralph
I think you're right, but i don't want it to be too loud either. I used to plug one of the outlet pipes (as mentioned above) on my 350 with borlas. It used to quiet it down a lot and then i could remove the plugs at the track. I still have the cat back from the 350, but it doen't look like the borlas would be an easy swap. they are 2 1/2" and the elbow is not at the proper angle to match the LT1 setup. I'll probaly just the sell the borla cat back and do exactly what you suggested. My guess is the stock mufferes are much more restrictive than the resonator. they only have a 2 1/4 inlet and are not straight thru. So i'll probably do mufflers first and then maybe the x-pipe depending on noise level.