is any one RMB better than another?
04-10-2010, 06:01 PM
#17
Nordschleife Master
I thought they all increase noise and I don’t think you can keep the stock cats with an X pipe. I believe only hi flow aftermarket cats will fit with X pipe and they don’t suppress sound as much as stock cats (nor are the as big or restrictive). I know for certain that an RMB will increase the sound.
http://www.performance928.com/cgi-bi...ss_parent=1128
Option 1: "Complete exhaust system. Ott pipe in front. Random Technology SuperStainless high flow cats, P/N 702500. Random Technology does not have a picture of the 702500 cat on their web site, but their 8100 series universal cat is the same size."
Option 2: "Here is another option with headers on a 6.5L motor. The exhaust is 3" diameter stainless. After the header collectors, are two 4" diameter 16" long mufflers followed by an X section crossover. The 4" diameter mufflers in front of the crossover could be exchanged for cats."
I think Louis Ott's car is the highest hp/liter (and probably also the highest BMEP at peak power) 928 engine out there, so these must be "right."
04-15-2010, 12:19 PM
#18
Here are the pics of the 3 different RMB's I've got on hand.
Left is something someone made up, it fits and works well.
Middle one, no idea who made it.
Right is an SLC's I think, it's what Roger sells and I think is the best built one.
Plan on selling the left and middle ones. Keeping the right one.
Left is something someone made up, it fits and works well.
Middle one, no idea who made it.
Right is an SLC's I think, it's what Roger sells and I think is the best built one.
Plan on selling the left and middle ones. Keeping the right one.
04-15-2010, 01:08 PM
#19
Racer
Join Date: Mar 2009
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Pardon me, that was theory. In theory, X-pipe will help both increase power and reduce noise, holding everything else constant. In practice, I don't know how to fit X-pipe to 928 without moving the cats -- I am just an internet engineer! ;-) Plus the Kuhn downpipes in my avatar don't need / can't benefit from an X-pipe because the turbines garble all the pulses (and everything else is most definitely being held constant...)
04-15-2010, 02:15 PM
#21
04-15-2010, 05:43 PM
#23
04-15-2010, 05:47 PM
#25
Yup, mine was obnoxious, you've heard it. I had planned on putting the larger resonators on (have a set) but really liked the way another car sounded with the GT muffler on it. So went that route instead.
04-15-2010, 06:20 PM
#26
Rennlist Member
Last edited by RKD in OKC; 04-16-2010 at 01:37 AM.
04-15-2010, 10:54 PM
#27
I put the 928 intl one on my 89S4 and its great. Just had a guy in a 911 stop me at the wash garage who thought I had converted my 928 to a Chevy v8 based on the sound. He runs out to stop me from driving away just because of the rumble. It is just mean enough and drivable. to me anything more noisy would get old fast.
Gregg
Gregg