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View Full Version : Muffler removal, straight exhaust



pecanflyboy
05-31-2011, 12:40 AM
2001 Mobius. I have a muffler leak and have read of all the problems other owners have had with the fiberglass mufflers. I'm considering the removal of the mufflers and replacing them with a straight exhaust tube. No leaks and it's simple.

I don't see any problems with getting water into the engine.

I'm not sure how loud it will be. Any feedback?

I don't think the engine performance will be affected. The long tube and exhaust below the water line should provide sufficient back pressure....?

Any advice is appreciated.

Jimmy

rdlangston13
05-31-2011, 09:53 AM
mufflers dont really provide much back pressure anyways and if you want performance you dont want back pressure. the straight exhaust will make cruising very loud tho

bergermaister
05-31-2011, 01:25 PM
Makes me think of the big chrome pipes off drag boats. Once your boat is moving fast enough so that the exhaust outlets are above the water line I'll bet the droaning roar behind it would be mind numbing...

newty
05-31-2011, 02:51 PM
mufflers dont really provide much back pressure anyways and if you want performance you dont want back pressure. the straight exhaust will make cruising very loud tho


Makes me think of the big chrome pipes off drag boats. Once your boat is moving fast enough so that the exhaust outlets are above the water line I'll bet the droaning roar behind it would be mind numbing...

You mean... completely AWESOME! I love the growl of a throaty smallblock.

rdlangston13
05-31-2011, 03:54 PM
You mean... completely AWESOME! I love the growl of a throaty smallblock.

as do i, but it might get old surfing or wakeboarding.

pecanflyboy
05-31-2011, 04:01 PM
I think it's funny that someone is worried about exhaust noise when my daughters have the entire boat shaking to the rap crap coming out of the speakers. It might be good to know the engine is still running.....lol

bergermaister
05-31-2011, 04:33 PM
Oh I'm on board with that sweet V8 sound - just think it would get old when you're surfing, boarding, etc. Would defeat the purpose of tower speakers.

I wish I could find a video clip of my old lowrider '69 chevy pickup I had in college for you guys. Sounded awesome but could be the reason I'm going deaf today. Built 350, headers to shorty turbos to 30" stainless megaphones that went from 2.5" to 5" openings out the back under the rollpan. I got compliments and complaints all the time including one really expensive one from the state patrol. He said he could hear me coming before he saw me.


That's why we have transom and driver remotes isn't it? Turn off the booty boppin stuff when they're all caught up in looking cool and crank up some Aerosmith or Van Halen. Then corrupt them with a little Linkin Park or Godsmack. hehehe

pecanflyboy
05-31-2011, 05:08 PM
Berg, you are cracking me up! I had a '67 Chevy Nova with Hooker Headers and Cherry Bomb exhaust. The cool thing was to put a butterfly just past the headers so that you could pull a lever and have straight pipes!

I'm gonna have to hijack the Ipod and infect it with some Van Halen and Rush!

J

bergermaister
05-31-2011, 05:41 PM
Yeah I knew I was out of the running for 'father of the year' when I was practicing tennis with my cute little 9yr old girl last summer and I noticed she's singing to herself word for word the lyrics of GodSmack "Straight out of line". Hmmm, wonder where she heard that?!


I had burned out glass packs on that truck with the megaphones for a few months but it literally sounded like a dragboat all the time. Could drive through parking lots and set off car alarms... Fun for a while but got old and driving on the freeway for more than 10 minutes was murder.

I can picture my kids driving a rod or classic of some sort when they're old enough. I'd much rather see them pull into the HS parking lot in an old chevelle with a raspy cam riding on some beefy BFG TA's than some punked out honda with a bunch of tin and plastic bolted onto it.

newty
05-31-2011, 06:43 PM
I can picture my kids driving a rod or classic of some sort when they're old enough. I'd much rather see them pull into the HS parking lot in an old chevelle with a raspy cam riding on some beefy BFG TA's than some punked out honda with a bunch of tin and plastic bolted onto it.

Amen brother!

pecanflyboy
05-31-2011, 08:35 PM
So, other than noise, a straight pipe should not give me any problems?

rdlangston13
05-31-2011, 09:09 PM
not that i can see

bergermaister
05-31-2011, 09:22 PM
-Sore mouth from a permagrin
-Guys constantly wandering up wanting to check out what you're running
-Nagging look from significant other along with offcolor comments about reliving the glory days
-Noticing you are saying "huh" or "what" more often...


Seriously - as long as the backpressure isn't a worry then you should be all good.

loudsubz
05-31-2011, 11:04 PM
I would never get sick of this sound

http://www.youtube.com/watch?v=qeGFrh5jaNM

pecanflyboy
05-31-2011, 11:13 PM
I just need to find a peice of stainless pipe to replace the mufflers. Is the rubber 3.5" ID or OD?

utilityvehicle
06-02-2011, 12:29 AM
It should create more throttle response when pulling from a dead stop

bergermaister
06-09-2011, 04:51 PM
So curiosity is killing me (and the fact that I'm bored stuck at work).

Did you get the straight pipe conversion done? Sound??

dusty2221
06-09-2011, 04:55 PM
When I bought my boat the P/o had removed the muffler and replaced it with thick PVC straight from the manifolds, it was ungodly loud and annoying. Sounded great at idle.....that's it. IMO of course :)

sandm
06-09-2011, 06:23 PM
man, I love the sound of a built v8- not much sounds better(except the whoosh of a large turbo spooling up), however I can't even imagine listening to that for all of the 230hrs I have put on my boat. that would get VERY old quickly.
at least with music, you can change it up or turn it off. you're talking 24/7 every time you're at the lake... yuck.. again imo :)

moombadaze
06-09-2011, 08:05 PM
well said, something about a healthy little small block

pecanflyboy
06-09-2011, 09:58 PM
I've ordered 5' of stainless 3" exhaust pipe, and had them put a 30 degree bend at each end and cut the pipe in half. I'm using these guys:

http://www.ashlandmufflerhouse.com/

I think I've got about $60 invested in the whole deal. I'll let you know how the install goes.

J

pecanflyboy
06-18-2011, 08:40 PM
Started a clean thread with the install.

http://moomba.com/msgboard/showthread.php?t=15335

deerfield
06-18-2011, 10:38 PM
pecanflyboy - Please be sure to report back on sound and performance. I'm not planning on making the change to straight pipes, just think it's interesting and reminds me of my youth as a gear head. Thanks for posting. - Deerfield

pecanflyboy
06-19-2011, 11:00 AM
pecanflyboy - Please be sure to report back on sound and performance. I'm not planning on making the change to straight pipes, just think it's interesting and reminds me of my youth as a gear head. Thanks for posting. - Deerfield

The main reason for the switch is to get away from the leaky mufflers. I'll let you know.

Canuckle Head
06-21-2011, 05:23 PM
The main reason for the switch is to get away from the leaky mufflers. I'll let you know.

I wonder if you had FAE at the end of the straight pipes would it make a difference in terms of sound. I have FAE and I can barely hear my boat which is good IMO.

pecanflyboy
06-24-2011, 10:50 AM
The winds finally died down yesterday, so we hit the lake with the new exhaust configuration.

I could barely tell a difference inside the boat. The tone was a little deeper, but it was not appreciably louder.

My riders noticed a difference in the sound from behind the boat, and commented that it was louder.

I think overall, the sound is not an issue, imho.

Jimmy

JDMobiusLaker
07-14-2011, 11:39 AM
Jamestown Distrubutors has very good prices on all sizes of required, flexible rubber wire reinforced exhaust hose. Its very good purpoe built material. Give then a call to order what is needed.

Our other boat is a 17' 1955 Chris Craft Sportsman with a CC 1964 GM/Chevy 283 small block. Doua straight 2-1/2" pipes out the transom. I like the sound when I'm driving it...its loud but mellow...i think the flexible hose softens up the harshness.