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  #11  
Old 07-10-2012, 05:13 PM
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LMAO!!!

Twinspoppa has a Vid of his 4.8is xpipe somewhere here.....

i dnt know...but if that is not enough..you can take the cats out...(2) of them the other 2 have the sensors....but should be happy with the x....
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  #12  
Old 07-10-2012, 08:59 PM
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I gotta hear this in person. You guys put so many doubts in my head with all those "I Agree" icons. Damn.
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  #13  
Old 07-10-2012, 09:24 PM
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JTMC's video is probably the best example of the x-pipe sound. Though I think it might be a tad deeper in real life.

2004 X5 4.8is X-pipe- YouTube
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  #14  
Old 07-10-2012, 10:28 PM
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Ohh man now that effin sounds great... I mean it's one off those exhaust notes you go like demmmnnn!! Hehe good stuff.. Def installing a xpipe tomorrow or following day.. Will record a clip once it's done .. After having the 4.8is for 3 years this is something I have to install
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  #15  
Old 07-10-2012, 10:40 PM
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goodluck bro...you'll definitely enjoy the sound..
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  #16  
Old 07-11-2012, 12:14 AM
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Is it just me or does it sound raspy? How does it sound under load? How about inside windows closed and opened?
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  #17  
Old 07-11-2012, 07:29 AM
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My 2; Personnally, I bought a 4.8is for the added power over a 4.4i. I'm not ready to loose power just for sound.

It has been explained here on this forum and I also I read on other performance forums how a X-pipe works.
It benefits of an exhaust pulse from the left bank croosing the X-pipe and 'pulling' ou sucking on the right bank to help the upcoming right pulse etc. As you can see, the timing of pulses crossing the X-pipe is very critical to have that suction effect. To achieve that 'good timing', the exhaust tubes length need to be the same lenght on both banks. Since our X5s do have a longer runner of tube on the left side, that pulse synchronisation is losted.
On our X5s, depending where the X-pipe is installed (more forward or rearward) the rpm at which the 'sucking' effect will happend will differ but won't be the whole rpm range.
Having pulses crossing the X-pipe from the left and right side at the same time will create a 'collision' or disrupted flow.

Regarding the H-pipe, there is just a minimal flow crossing at 90 in the middle section and this is the way the sound of the V8 is equalized. The H-pipe is not designed for a sucking effect like a X-pipe, so it rely on the middle section to tune the sound, not increase performance.

I know this is all theory, but exhaust design is a complex thing.
I am really surprised to hear many owners talking about the nice sound of an X-pipe and never one of them mentionned some lost of power. (exept one that switched to an H-pipe)
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Old 07-11-2012, 11:19 AM
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Quote:
Originally Posted by SlickGT1 View Post
Is it just me or does it sound raspy? How does it sound under load? How about inside windows closed and opened?
Yes, it sounds raspy because its cold and not under load. When its warmed up and under load it is MUCH smoother and sounds awesome.

Here's a video I just took this morning. Unfortunately, same conditions - cold and not under load. Yes, it will sound raspy. I will try and take a video when its warmed up so that people can really hear the difference.

BTW .. do NOT have your speaker up too loud after you hear the startup (love the growl!). The wife guns its good unexpectedly and its like a banshee.

2004 BMW X5 4.8is stock with x-pipe - YouTube

When it comes to a loss of power from the x-pipe, I could not say either way. I haven't noticed a loss of power but I do not tow or even drive it daily. I have no regrets doing the x-pipe.
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  #19  
Old 07-11-2012, 12:18 PM
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It always sounds different on a cold engine when you start in morning and the sound gets better after the engine heats up.
On a cold winter morning, you may wake-up your neighbors when you start in the morning.
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  #20  
Old 07-11-2012, 12:22 PM
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Quote:
Originally Posted by TwinsPoppa View Post
I haven't noticed a loss of power but I do not tow or even drive it daily. I have no regrets doing the x-pipe.
Same here. No loss of power, it actually feels more power though.
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