Hey folks, so I'll be creating an exhaust setup soon. I want to make it simple, so I figured it would be easiest to not go over the rear axle/around brake lines. If I have turndowns right before the rear axle, will that cause any problems with the exhaust fumes? If I am sitting at a light will the fumes potentially meander up into the cab? An reason not to have turndowns before the axle?

 

mine are that way. its no problem for me

Just seal the trunk up well so its isolated from the cabin...

 

Eh, how so? Anything other than the package tray I should be worried about sealing?

 

that has most of the holes.. If you look there a few holes by the rear roof pillars where they meet the fenders. I used an expanding foam to seal them.

I also used a sheet a heavy cardboard and built a wall with it that fits behind the insulation materiel on the backrest of the rear seat. I sealed it to the car with foam as well. There are also some holes behind the backrest of the rear seat that should be sealed as well.

-Gun

 

hmmm you wouldn't want your windows open in a traffic jam ?!

 

Prebent exhaust systems and partial systems are relatively inexpensive and most are mandrel bent. Why fool around with making your own and risking fumes and other problems? Here are a pair of mandrel bent tail pipes for a 1966 Mustang that go over the rear axle for 130 bucks:

http://store.summitracing.com/partde...5&autoview=sku

 

2 issues.

1. It will be much louder like that
2. Check local law, turn downs are technically illegal in many many many places on a street car.

 

In Texas the exhaust must exit further rearward than the passenger compartment. I can't imagine that California vehicle law would be less strict than that.

Also, depending on the mufflers used, it might "drone" on a lengthy drive. Sometimes this can set up a noise that will make you want to jump out of the car while it's traveling at highway speed.

 

I used to have them on my '73 Duster, but I was young, poor, smoked
cigs and listened to loud music! Now there's no way in h@!! I would have
those on my car, so I guess it has something to do with your age and
tolerances.
Legally, I'm sure Calif prohibits them for steet vehicles too. I hear if you get a "fix-it" ticket in Calif you'll have to take your car to a B.A.R. inspection and they'll also require you to restore all the smog devices and components that were factory installed in the year your car was built , so beware!

 

I hate turndowns. They turn the cab into a giant resonator, and you still get fume issues if your windows are down at a stoplight. The idea is for the guy behind you to hear your exhaust, not everyone around you, and definitely not everyone inside the cab. Prepare for hearing problems down the road.

Fakesnakes' prebent tube idea works great, as would taking the car to a muffler shop to have them weld up some pipes.