Completed exhaust with JBA #6822s headers.

[EKOBS]

Hi folks,

I just thought I’d post some pictures of my now completed exhaust. I did manage to find an over axle pipe, but maybe I should’ve taken Tomcat’s advice to check-out the Dynomax web site. Anyway, I ended up finding an over-axle pipe for a Dodge on the Magnaflow web site. It’s a four inch, two piece, arrangement and after cutting out the little ‘over-axle’ hump and replacing it with a straight four inch tube it fit just fine. I like the sound and have received a few compliments from the neighbors on just how quiet it is. I don’t have any driving time with it yet, but I’m looking forward to it. You maybe able to see the ‘smoke stack’ on the #5 tube on the driver’s side, I welded this on for purposes of keeping the E.G.R. System functional and hopefully remaining emissions compliant. There are also O2 sensor bungs welded on elsewhere along with cat. converters on the end of each collector. I chose not to make my own collectors, thinking it wasn’t worth it considering the conservative cam. specs. of the stock engine. It would have been nice to have a chassis dyno report of before and after results, but I don’t have money for that.

 

[Orpedcrow]

Dang dude, that turned out nice. I’d love to see how the muffler and tailpipe fit up underneath.

 

[EKOBS]

Hi Orpedcrow, thanks. I tried to tuck everything up as much as possible and when I finally put the tail-pipe piece in place it all seemed to hang rather nicely. That first pic shows how I solidly attached the ends of the headers to a bracket I made which attaches to the bottom of the transmission. The second shows the very beginning of the tail-pipe piece, it is somewhat deceptive in making the muffler appear closer to the drive shaft than it really is, hopefully the third shot is more representative of this clearance.

 

[L31MaxExpress]

Definitely an interesting setup. X to a Y. Probably does make it a bit quieter.

 

[Orpedcrow]

That fits really good. Thanks for sharing! I need to see if I have that kind of clearance under my half ton.

 

[EKOBS]

Definitely an interesting setup. X to a Y. Probably does make it a bit quieter.

Hey L31MaxExpress,
This whole project became necessary when most of my exhaust rotted and fell off the car, the down tube/cross-over pipe remained, but even the cast manifolds were warped and popped some of the studs. I knew this was coming and I had originally intended to gather all the information necessary (basically all engine specs, head flow, and GM dyno. reports) to have Burns Stainless make a pair of merge collectors and hopefully give me direction on the rest of the system, which I then would have welded onto the headers myself. After some discussion with others more knowledgeable about pulse wave tuning than myself I realized this was a senseless exercise given the limited ability to even accomplish pulse wave tuning with the stock L29 engine. With this realization I decided to just use the JBA #6822s headers more or less as they were with slight changes for emissions purposes. Moving on to the center section I knew the driver side exhaust could not cross over to the passenger side under the bell housing in the stock manner, because of the header length, so I crossed over under the tail shaft housing and incorporated the tangentially siamesed crossover as soon as possible. At this point I knew pulse wave tuning was out, but I still thought the siamesed crossover was useful for noise reduction. Then I had to collect the two three inch tubes (7.07” squared area each) into a muffler. With my limited patients I couldn’t find a suitable muffler or other method to combine the two, I do not have a tube bender so I was reliant on commercially available bends, but I do have a couple band saws and a tube stretcher so I thought I could do this. I did find a ‘Y’ collector available commercially, it is two 3” tubes into a single 3” outlet, that fit into a 3” Magnaflow muffler so I went with it and right after the muffler I fit a cone which expanded it to a 4” tube (12.5” squared area) for the tailpipe. I understand this is less than the sum of two 3” tubes, but I’m hoping that this will not be a meaningful restriction and who knows maybe it will act like a merge collector, doubtful. I believe the only way to measure the effectiveness of engine/exhaust changes is an engine or chassis dyno., but in this situation I don’t think it’s warranted given the stock nature of my car. Hopefully I’ll see some noticeable improvement in gas mileage, but I’m not expecting much. I’ll be happy so long as it is a durable exhaust and doesn’t cause any problems with emissions inspection as I’m code free so far.

 

[jaywestfall]

Hi folks,

I just thought I’d post some pictures of my now completed exhaust. I did manage to find an over axle pipe, but maybe I should’ve taken Tomcat’s advice to check-out the Dynomax web site. Anyway, I ended up finding an over-axle pipe for a Dodge on the Magnaflow web site. It’s a four inch, two piece, arrangement and after cutting out the little ‘over-axle’ hump and replacing it with a straight four inch tube it fit just fine. I like the sound and have received a few compliments from the neighbors on just how quiet it is. I don’t have any driving time with it yet, but I’m looking forward to it. You maybe able to see the ‘smoke stack’ on the #5 tube on the driver’s side, I welded this on for purposes of keeping the E.G.R. System functional and hopefully remaining emissions compliant. There are also O2 sensor bungs welded on elsewhere along with cat. converters on the end of each collector. I chose not to make my own collectors, thinking it wasn’t worth it considering the conservative cam. specs. of the stock engine. It would have been nice to have a chassis dyno report of before and after results, but I don’t have money for that.

Wow, the flanges on those headers are definitely thick!