View Single Post
      07-28-2012, 11:44 AM   #1
Z4MHawk
Private First Class
Z4MHawk's Avatar
United_States
3
Rep
165
Posts

Drives: '06 Z4 M Roadster
Join Date: Feb 2009
Location: tulsa

iTrader: (0)

RPI Modification

Ok, even after reviewing that great summary for the after market exhaust modifications I decided to go for that tunnel reverberating, tooth aching, car alarm setting, and hyper droning RPI. No complaints on what I suspected was going to be an authenic track sounding exhaust, even after the initial 500 mile break in and one excesive noise warning citation(story for another thread w/ pictures).

However, I had a couple of thoughts that perhaps many of you have already considered. Could I modify this flow-thru exhaust system to deliver "slightly" lower db's?

I had always thought the small, second tail pipe was a filler for the OEM cut-out, but never really looked at it before installation. Since there is no carbon build-up on it, this is either true or its flow must be restricted. There is a mesh patch inside it as it splits off the larger diameter exhaust pipe

Has anyone removed this mesh patch to allow the smaller pipe to receive more air, or any air?

Thanks!
__________________
'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.

Last edited by Z4MHawk; 07-28-2012 at 03:05 PM.. Reason: further research
Appreciate 0