Hi! How to quiet those side pipes?

[Dimis]

Originally Posted by shilpa

Will putting a good "normal" exhaust/muffler setup to the back allow the engine to breath as much (or almost as much) as the side pipes? I would imagine a really good set up would allow the engine to breath just fine....

If I could build a car with "fake" side pipes and a super quiet rear exhaust system I would be very happy...

You'll find that a cross flow system under car exhaust can actually produce an increase in HP as opposed to side pipes.
At least this seems to be the majority of anecdotal experiences of most who have done it.

I for one think that there are advantages of under car exhausts, including no snake bite & noise, but I still prefer a 427 with them pipes (active or otherwise), it adds to the look & attitude of the car

Have search on the Australian forum of Clubcobra.

[YerDugliness]

Originally Posted by mtpockets

Try earplugs, I wear them all the time now. Not so much for the exhaust note but for the wind noise.

Originally Posted by SunDude

Wear earplugs. I do.

That way the Cobra sounds as it should, and I save my hearing.

Originally Posted by shilpa

ParickT - mine are a bit smaller than those... I use the ones I plug into my ears. Although I do use those at my shooting range... ;-)

Agreed....although I think you'll find that the "in-the-ear" plugs are less effective than the "ear-muff" style that Patrick shows. I use the ear-muff style, they eliminate the "chuffing" from the wind buffeting my ears as well as the "chuffing" from my slip-fit exhaust, and I REALLY like the way they change the tone of the sidepipes to a lower, more gutsy tone. People laugh at me when they see me, but I just smile and wave. I have a noise induced hearing loss from driving a tractor as a young man and I MUST protect what hearing I have left (I'm a musician), so sometimes I even combine the muff-type hearing protectors with the in-the-ear type....it all depends on whether the ears are already "ringing" with tinnitus from the previous night's noise exposure or not.

Originally Posted by Dimis

You'll find that a cross flow system under car exhaust can actually produce an increase in HP as opposed to side pipes.
At least this seems to be the majority of anecdotal experiences of most who have done it.

I for one think that there are advantages of under car exhausts, including no snake bite & noise, but I still prefer a 427 with them pipes (active or otherwise), it adds to the look & attitude of the car

Agreed, again. IMHO, the 427 body style really NEEDs the sidepipes to complete "...the look". The 289 body style, not so much, and I really think the "street" models (routinely don't have hood scoops or side-exit exhausts, whether 289 or 427 style) with under-car exhausts are SO CLASSY!!

I could see a cross-flow under car exhaust system being very doable....shorty headers (maybe Mustang 5.0 GT factory style) and aluminized exhaust tubing, using very thin mufflers with ovalized pipe under the car to increase ground clearance...OR, chambered ovalized pipe with NO mufflers. The under-car/rear exhaust, if designed to be free-flowing enough to retain the majority of the horsepower, really seems to be the best of both worlds, IMHO. They sound good, look classy, and you can actually hear the empassioned pleas emanating from the sweet, young thing in the seat next to you as she sobs and begs for you to slow down !

Cheers from Dugly

[2FastCobra]

Add a turbo, the car will not be as loud and you will have a few hundred extra HP.