Fred,

I totally forgot you had a Dinan setup. Are those TWO Dinan mufflers with custom tips you have on now, or one Dinan muffler (left side) and false one (right side)? Just curious ... why the feeler thread? Dinan performance/sound not doing it for you? Just curious. Just from reading the links to the parts you provided, it looks to me like you might be on to something here! Good luck!

 

You're exactly right, Roleez.
The one on the right is dummy one and I don't like it. Also, I want tips to be at center of those exhaust tip openings of the bumper instead of closing to innermost.
In my opinion, I really like Dinan's exhaust, but I want quad. M5 bumper looks really good and I like it. So with a few hundred $, I might have a good cat-back exhaust system. That's why I have this "Feeler" thread so expert can jump in and give me some opinion.

Talking about Hamann, RDSport, Dinan, Eisenmann(?), etc, we can understand why they're so expensive.
First of all, the market is too small, so increasing to higher price would compensate for small market sales.
Second, the dealer selling those parts has to make some 10%, and brandname company tunner (Hamann, RDS, etc.) have to make something like at least 40% (to be conservative) to cover engineering and marketing cost.
All in all, the cost of muffler would be 1/2 the cost of what it's selling and I'm quite very conservative to guess that.
It's very understandable that we should pay for high price for brandname because they are plug and play. Very minor pipe bending to make it it while these proposed exhaust that I have here require all kind of custom bending all the way. In addition, brandname company has spend tremendous amount of time to study and produce sound exclusively while aftermarket might sound obnoxious.

However, I'm quite optimistic and I'm willing to take a chance, but I need to spend more time to learn about exhaust just like what I've done for BMW electrical/electronic system. Once I have clear understanding, I'd step a little bit further. Also, I've spent too much money currently (ACM, iPhone, 32" LCD, laptop, new side view camera), so I have to wait for next few month budgets coming

 

nice project Fred - your research above looks good > looking foward to see how it develops !

 

Thanks, Andy, for encouraging. I'll work on it

 

Im interested in that X muffler, let me know how it works out for you

 

Please update you project when you can. I am going to a quad setup eventually, but I just can't figure which way to go.

 

Project is on-hold for a month due to budget constraint
Surely I'll keep everyone updated

 

This looks like a good set up. Im having the M5 rear bumper installed and, I have a OEM M5 Exhaust and I found out the left side wont fit. So maybe I'll sell it and pick up your setup, and save some $$. Thanks for the idea.

 

What Silencers Would you use?

 

Those are listed in the first post