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Discussion Starter #1
I have been searching far and wide for an aftermarket rear air diffuser and there just does not seem to be any available. I know there is the Steve White dealership one and everyone seems to like Jeff Dunham's. The Steve White diffuser is just a little to ordinary for me and I am looking for something more aggressive. Jeff Dunham's has a sweet diffuser but I have read the shop wants 3000 to make it. Plus you would have to do something with the exhaust. So after no avail finding one to buy I decided to make my own. I am a Mechanical Engineer and have some experience in manufacturing which is why I decided to start down this path in the first place. So with the help of my buddy we just got done mocking up our vision for a rear diffuser on the challenger. We just made the mock out of card board, glue, tape and black spray paint. Our plan is for the final version to be made out of sheet metal (0.035" thickness?) and powder coated. Let me know what you guys think! All criticism is welcome! With the lack of options out there currently, we are hoping (down the road, maybe next year) to make some of these for anyone interested. Not sure on price yet but please post if you would be interested.
 

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I took a good look at it and... I like it! How it extends past bumper and exhaust will actually work how intended to.

I'd be down for one when product is finished.
 

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The middle part looks good. I dunno about going under the exhaust and out to the side part. That part doesn't look good to me. Especially if you're looking at it from the side.
I'd be interested depending on the material you use and how lightweight it is. Steve White one is about 14 lbs if and is made out of aluminum if I'm not mistaken.
I like this one a lot but I don't know where he got it from.
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That looks great! I have an Arrington Diffuser on the Challenger and a Steve White on my other car. I like yours a whole lot better! Please keep me in the loop. I would love to add one of these to my next project.
 

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I like it too
 

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Not bad at all, I think that you are on to something here!
Keep going on it and I'm sure that others will want something like that!!


Nice Job Dude!:thumbsup:
 

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I would buy one.

I've been thinking about pulling the trigger on the Steve white diffuser for a while but I'd prefer something more aggressive.

I hope you continue forward with this project.
 

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Discussion Starter #10
Thanks for the thoughts guys! I will definitely keep this thread updated as things progress. We do not have a timetable set but hope to have completed something by the end of the year. We are set on completing this project.

We really like the 'race car' look which is why we decided to extend it under the exhaust. We were also going for something that had a clean look but still pretty aggressive. We also assumed some would think it was too much. The good part about the way it is made is that we could build just the middle section HEMIZSP. We actually almost stopped there because it was simple and looked good. As we build something out of metal I will install and post pics of just the middle section. The dimensions are slightly smaller than what ghostrt was building so I would assume weight would be similar. Probably around 20 pounds, give or take a few.

We have not figured out exactly how this will connect under the car yet breeeze. We are envisioning something similar to the Steve White diffuser. Probably have to drill a couple holes into the spare tire compartment as well as the lower valence. We think we are going to make a custom bracket to hold the sides around the exhaust. There is actually a couple threaded holes in the frame above each exhaust pipe we plan to use.

I appreciate the responses and will keep this posted as we go! FYI, this is a 2014 R/T that I am designing this on. Don't think 08-14 will be much different.
 

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Why not build it in 3 pieces. Middle and the 2 sides. Some of us have different exhaust tips. Also, the 15s have a different rear bumper. I doubt it'll work on the 15s. Another suggestion, what do you guys think if it's made out of hard plastic just like on some oem cars. Maybe less expensive too? Less work?


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Discussion Starter #13
I believe it will work for any model '14 and older. Depends on exactly how it would mount. Obviously all have the spare tire compartment and rear valance to attach to. Problem would be the sides though I believe it could be modified to attach to valance on corner as well. The corner and valance in general is pretty sturdy. I agree that it probably would not work on the 15. It is essentially three pieces with the one middle piece and then the two sides get attached.

Plastic would be cool as well and probably weigh less. Problem is that we have no clue how to do that. LOL. It would definitely give more of a OEM look to it. Finish would be limited as well. I think I want mine to be a nice shinny black to make it stand out a bit. It would be a nice possibility for sure.

I think most exhaust tips would still fit and look right. They would just need to use the same cut out in the valance. Size could be issue. Different tip would need to be relatively same size as the stock one. And as long as it isn't something like a circle-ish exhaust tip.
 

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Maybe talk to a company that makes plastic parts. Have them make a mold. These companies already have the machines. All they'd need to do is put in the mold. I dunno. Just thinking out loud.
Lots of guys have the round tips like mine. A little bigger than oem.
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Discussion Starter #15
Yea that is a possibility for sure. I think we obviously have to get down the road a bit on this before we get to think about plastic but I like the idea!

I have actually never seen those tips but I like them! We modeled the side pieces with a half inch below the exhaust. The top also has a half inch between the valance and exhaust tip. So there is some 'play' room. It might require raising the exhaust tip closer to the valance but I think they could fit. Obviously most would want something to bolt right up but I do not think there is anyway we can get around some slight modification. And especially so with aftermarket exhaust tips.

There isn't much room to lower the piece under the exhaust. One and a half inch is all. Though it is possible and I believe we could make it that way, I am not sure if it would look good. It might though with bigger exhaust tips. Will need some R&D on it.
 
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