Muffler Delete on my 4.8i - Pics
 

Cold Start video: https://youtu.be/TBuLhD3n3s0
Rev video: https://youtu.be/xx3kq3vRxgQ

I fabricated and installed a muffler delete on my 4.8i E70 over the weekend. It's a fairly simple job. Parts used were:

- 2x 90 degree 2.5" mandrel bends
- 4x 45 degree 2.5" mandrel bends
- 2x dual 3.5" outlet, 2.5" inlet stainless tips
- 2x 2.5" exhaust clamps

For those curious, 16 gauge 2.5" exhaust tubing slips PERFECTLY right over the OEM exhaust pipes where they enter the stock muffler. This setup is also extremely easy to swap back over to the stock muffler if need be (with an exhaust band clamp setup).

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To tame down the rasp, I will be adding two small resonators in the muffler delete pipes (Vibrant Performance Part No. 1792). This shouldn't change overall volume much, but should even out the high-notes.

Update:
Added two Vibrant resonators. Sounds much better. Still has all of the low bass notes without as much raspiness. Cold start video: https://youtu.be/TBuLhD3n3s0

http://i.imgur.com/JRnWA7v.jpg

I love those tips. Used them before on other BMW's. Such a clean and sporty look.

Nice work. We need a sound clip now. I'll be doing cutouts on my 4.8is to bypass the factory resonator at some point. Can't wait to hear what the Dinan mufflers sound like without the resonator.

Thanks. I'll see what I can do about a sound clip. I really need a better microphone than what my iPhone has. It just doesn't do it justice.

I've been wanting to do this since I bought mine, where did you get the quad tips from? And what size?


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Tips are from eBay: "2X Exhaust Dual Slant Polished Tip Staggered Stainless 2.5"In 3.5"Out Left Right" Paid $78 for them.

No video?

In addition to adding two small resonators to tame the higher-pitched rasp when getting on the gas hard, I will be adding 1/4-wave "j-pipe" resonant tubes to eliminate the drone from 1600-1800 RPMs. They will need to be about 30" long per side. Luckily, there is plenty of room back there to add these.

Total cost, including the resonators to be added is just under $300.

Added two Vibrant resonators. Sounds much better. Still has all of the low bass notes without as much raspiness.

http://i.imgur.com/JRnWA7v.jpg

Looks good. Waiting anxiously for a sound clip. ;)

I used Mustang Gt500 mufflers to get rid of the drone and still maintain a deep throaty sound. Fairly cheap! I also have sound clips. Videos are linked under my name.