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      08-30-2012, 07:51 AM   #1
UberTaner
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Drives: 2007 BMW Z4M Coupe
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RE El Diablos

Hey gents!

A Z4M owner here from deep dark South Africa

So I have been doing a lot of research over the past 6 months on a different exhaust for my Z4M - specifically the mufflers. I was looking for someting that gave the car a much more aggresive sound track - the standard boxes are a little too tame for my taste.

So after many many many forums, internet sites, youtube videos I narrowed the list down to the following:

Supersprint
RPI
Rogue Engineering El Diablo

After a bit more thought I scratched off the RPI's - given my car is a daily I think the noise and drone would have become too much. The SS option in SA is priced way too high and so I decided on the RE boxes. (Being called Diablo's is a nice little perc too) IMO they are also the best looking pipes for the Z4 - I really like the nice chunky bevelled edge look and look like a top quality product, no corner cutting.

So they arrived this week and I dropped off at SAV Speed for installation with pre and post dyno runs - I wasn't expecting much but wanted to document it anyway as I havent seen it done elsewhere.

So picked it up from Sav yesterday afternoon and wow... car sounds fantastic!

There is now a lot of deep down bass which transitions into a more exotic sounding M scream as the revs climb.

So between 1 - 3k rpm you get some deep Korn style bass guitar sounds, from 3k - 5k the induction form the Gruppe M takes the lead with all kinds of barking and frothing noises, and from 5k - redline you get the exhaust wailing with some induction roar to complement it in the background - really love the new sounds and improved vocal range of the M with these on.

In addition under lift of or as you get the throttle back on you get some nice gurggling and popping noises, sounds very raw and un-synthesized - exactly what I was looking for!!

There is some drone between 2k - 3k but not overly concerned about it. I will drive for around 2k km to give them time to settle in and re-evaluate. If it is still there and bothering me I might dynamat the boot.

An added benefit I wasn't expecting is a jump in power - an extra 6kw according to the dyno at Sav - See attached dyno graph (Note: I'm in JHB which is 1700 metres above sea level and also SAV's dyno is known for being stingy - it's more about the movement between dynos than the actual readings)

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      08-30-2012, 09:26 AM   #2
smellyborrelli
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wow that is a nice increase for just a setion 3. i just took my diablos off for a set of RPIs
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      09-01-2012, 03:23 PM   #3
UberTaner
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Drives: 2007 BMW Z4M Coupe
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Hey Smelly
Howcome you changed? What are the major differences betwen the 2 given you have now owned both?
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