2003 X5 4.6is Exhaust Mufflers

[m5james]

Originally Posted by al98

First of all, thank you everybody for the valueble input and comments. I really appreciate.

The 4.8is muffler is quite different if you look at realoem diagram. Also different parts #. The tips might look the same from rear view.

I guess the value shoud be somewhere between $300 and $400.

I also talked to my indy. They said it's a max 1 hour job. Measure and cut the pipe and swap them. Use 55mm clamps (one pair, $30 each they quote me) to secure them. This would leave a chance for future's change, say for a pair of Dinan's. I think that makes sense. So the total would be around $500 if I am luck to get them at $350.

Again, thanks everybody.

I know they're different exterior wise, I was more curious as to inside. When Britalman was still selling E39 M5 exhaust, they cut open stock and every other style of muffler available for that car to show how much more batting and insulation they used in of it. I just wasn't sure if anyone might of known of some similar pics floating around for the X5 mufflers. Other that stealership price differences, it seems no one knows the difference internally, so how does one decide which is the best?

[powers1]

Originally Posted by al98

Well, I guees the 4.8is tips don't quite look the same as 4.6is. The above diagram is 2003 Nov production 4.8is.

The 4.8is are indeed a larger muffler but still "plug and play" on any 4.6is...!
Its a straight swap....

[m5james]

Larger doesn't necessarily mean better though. I've seen 540/740 stock mufflers cut in half and gutted, and I'm surprised how restrictive they are. The 4.8's could be more restrictive for off the line grunt due to the fact that they are larger and maybe have more chanmbers, so maybe 4.6 mufflers are better for midrange/hi-end power since they're smaller and potentially have less chambers....just guessing here. That's all i'm trying to figure out.

[mrbmwx5]

Check out the sound clip .......my post #1
http://www.xoutpost.com/bmw-sav-foru...eo-inside.html

[dpgx5]

Would the 4.8is system fit a 4.4i? Just re-old&re-new, or is the piping diff?

[Tleong]

Originally Posted by dpgx5

Would the 4.8is system fit a 4.4i? Just re-old&re-new, or is the piping diff?

I believe it would judging from past threads. I actually think someone did it before but couldn't find the thread.

[al98]

Originally Posted by mrbmwx5

Check out the sound clip .......my post #1
http://www.xoutpost.com/bmw-sav-foru...eo-inside.html

WOW ... awsome sound! Like 2006 M5 v10, especially that low hum starting part. This is one of the most amazing mod I've ever seen. How could 4.6is/4.8is mufflers make a v6 sound so differently?! day and night. I believe you also got 6 or 8 hp gain! flow better.