RPI Modification

Finnegan · 08-05-2012, 11:00 PM

Quote:

Originally Posted by Roffle Waffle

In that little free panel where people usually relocate their 12v outlets to. Hidden under the dash area (above the seat heaters and ashtray)

it comes with a switch you hold for 4-5 seconds for the flaps to fully open. You can stop it anywhere in between, but I'm gonna treat it as an on-off switch.

Should sound very interesting, since some air will still hit the stock mufflers

Beedub · 08-06-2012, 11:27 AM

going to install my DKF damped hangers to see if i can get rid of some of that horrific drone!!, hardtop has made it much better however... with the roof off, it sounds great, with the fabric roof up, its unbearable!! lol

dubsesd · 08-20-2012, 08:47 PM

And how did the hangers do? Did they help?

Z4MHawk · 08-24-2012, 08:09 AM

UPDATE:

I removed the perforated screens from the side of the main tube with a round grinding stone on the end of bit extender and air grinder. No change in the tone of the RPI exhaust at idle, but a significant tone change under throttle. There is also more rasp...so it would appear that the screens are used for deeper tone from the main tube and to control rasp.

I will get it out today and see what it sounds like in the dreaded 2500 to 3000 rpm range in 1st and second. I will also place a sound recorder in the cab and will post the audio clip.

08-06-2012, 11:27 AM	#24
Beedub Major General 423 Rep 5,327 Posts Drives: 2007 Z4 M roadster vt2-500 Join Date: Sep 2007 Location: UK iTrader: (0)	going to install my DKF damped hangers to see if i can get rid of some of that horrific drone!!, hardtop has made it much better however... with the roof off, it sounds great, with the fabric roof up, its unbearable!! lol __________________ Z4MR VT2 - Clubsport build. Multi award winning Detailing \| Wrap \| PPF specialists UK based - www.topwrapz.com
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08-20-2012, 08:47 PM	#25
dubsesd #dubspec 6328 Rep 5,200 Posts Drives: G05 X5/ 2016 F80 M3 INDVL Join Date: Jul 2011 Location: Ottawa iTrader: (2)	And how did the hangers do? Did they help? __________________ LCI ///F80 M3 Individual Atlantis Metallic / Black Full / Carbon Cermics / 6MT MPE / M Performance & Carbon package / KW v3 / 20" HRE R101LW / 20" HRE 527s / Michelin PSS / 20% tint / 3d Design / Streckenn splitters / OEM GTS hood / EAS Carbon seatbacks / Carbon RKP sideskirt / Bootmod3 / M Performance Tri color alcantara / AWE S Flow instagram: @ dubsesd
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08-24-2012, 08:09 AM	#26
Z4MHawk Private First Class 3 Rep 165 Posts Drives: '06 Z4 M Roadster Join Date: Feb 2009 Location: tulsa iTrader: (0)	UPDATE: I removed the perforated screens from the side of the main tube with a round grinding stone on the end of bit extender and air grinder. No change in the tone of the RPI exhaust at idle, but a significant tone change under throttle. There is also more rasp...so it would appear that the screens are used for deeper tone from the main tube and to control rasp. I will get it out today and see what it sounds like in the dreaded 2500 to 3000 rpm range in 1st and second. I will also place a sound recorder in the cab and will post the audio clip. __________________ '06 Z4 ///M Roadster: Silver Gray Metallic; Gray soft top. Zeckhausen CDV. ESS VT1 445 Supercharger. APEX ARC8's. Dunlap Direzza Star Spec's. Strong Struts. Royal Purple. RPI Exhaust w/ DKF hangers.
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