bit of confusion on exhausts

[sad_rocc@veedub.com (Dan Smith)]

Well, I don't know why I didn't think of this before, but does anyone have good aftermarket muffler reccommendations? I'm looking for something along the lines of low purr/growl as opposed to high, annoying buzz. I have some Audi muffler on now and it doesn't sound like much at low rpms but when I step on it and get into the higher rpms its got a really nice, deeper hum. Here is what I'm looking at for mufflers. I'm going more for looks and sound than performance. 
1. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33636&item=1873521173&rd=1
2. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6771&item=1873503132&rd=1
3. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1873400152

I prefer 2 and 3 because I know how the exhaust travels in them and I know what's inside, where as #1 could be stuffed with cotton for all I know. Also, 2 and 3 are straight through. 2 has the typical canisters on rice cars which makes me leery of the fartcan sound but 3 is a bit expensive.

Dan
--- "Joe Doty" <rocco2nr@hotmail.com> wrote:
>I totally agree on the backpressure being a myth thing.  I think it's a
>word made up by people who don't know what the hell is going on.
>
>I don't think you have to worry about losing low end, if that's what
>you're stressing.  However I would recommend getting at least one
>resonator to avoid the fart can sound....its tough to make a free
>flowing 4 cyl exhaust sound good.
>
>Joe Doty
>IT/Development
>joe@lcnetwork.com 
>
>-----Original Message-----
>From: Dan Smith [mailto:sad_rocc@veedub.com] 
>Sent: Tuesday, November 26, 2002 11:40 AM
>To: Ryan H; scirocco-l@scirocco.org
>Subject: Re: bit of confusion on exhausts
>
>Well, that makes sense. For more info, the TT exhaust is 2.25", the
>muffler is 2.5" inlet, dual 3" outlets. (God I hope it doesn't sound
>like a fartcan) It seems velocity would be the same as in a stock setup,
>as the sizes aren't changing, just the restrictions, or lack of. Am I
>correct? And do others agree that backpressure is a myth?
>
>Dan
>
>--- Ryan H <rhock99@epix.net> wrote:
>>I can't answer your question about your exhaust, but I can offer my
>knowledge on back pressure...
>>This is a big myth... from what I have read, you don't want ANY
>backpressure, you want exhaust gas velocity.  The reason people think
>you need backpressure is simple: If your engine only generates 250 cfm
>of exhaust gases, and you have a 3.5" exhaust, the exhaust has so much
>room when it makes it to your 3.5 inch pipe, that it has no need to move
>further down the pipe, and it creates a sort of wall.  This causes
>exhaust gas velocities to slow, and interferes with the ability of the
>exhaust system to "scavenge" exhaust gases from the engine when the
>exhaust valves are open.  This means the engine has to force exhaust
>gases out the valves, instead of it being sucked out by the exhaust
>system, and this is where systems with "too little backpressure" (in
>truth, exhaust gas velocity) lose their power.
>>I guess it would take some experimentation on your part to see what
>allows your car the maximum exhaust flow rate.
>>
>>> 
>>> From: Dan Smith <sad_rocc@veedub.com>
>>> Date: 2002/11/26 Tue PM 01:59:12 EST
>>> To: scirocco-l@scirocco.org
>>> Subject: bit of confusion on exhausts
>>> 
>>> I have a stock 1.8l 16v, which hopefully at some point will change.
>I've been looking into an aluminized TT setup with no resonator and
>swapping the muffler for a fireball dual tip straight-thru design. I've
>heard though that you want some backpressure and if your exhaust is too
>free flowing, then you actually lose power. What exactly is the real
>deal on this? And would this setup be too free flowing? Suggestions,
>comments, ect.
>>> 
>>> Dan
>>> 
>>> _____________________________________________________________
>>> Sign up for FREE email yourname@veedub.com
>>> from http://www.veedub.com
>>> 
>>> _____________________________________________________________
>>> Select your own custom email address for FREE! Get you@yourchoice.com
>w/No Ads, 6MB, POP & more!
>http://www.everyone.net/selectmail?campaign=tag
>>> 
>>> _______________________________________________
>>> Scirocco-l mailing list
>>> Scirocco-l@scirocco.org
>>> http://neubayern.net/mailman/listinfo/scirocco-l
>>> 
>>
>>
>>_______________________________________________
>>Scirocco-l mailing list
>>Scirocco-l@scirocco.org
>>http://neubayern.net/mailman/listinfo/scirocco-l
>
>_____________________________________________________________
>Sign up for FREE email yourname@veedub.com
>from http://www.veedub.com
>
>_____________________________________________________________
>Select your own custom email address for FREE! Get you@yourchoice.com
>w/No Ads, 6MB, POP & more!
>http://www.everyone.net/selectmail?campaign=tag
>
>_______________________________________________
>Scirocco-l mailing list
>Scirocco-l@scirocco.org
>http://neubayern.net/mailman/listinfo/scirocco-l

_____________________________________________________________
Sign up for FREE email yourname@veedub.com
from http://www.veedub.com

_____________________________________________________________
Select your own custom email address for FREE! Get you@yourchoice.com w/No Ads, 6MB, POP & more! http://www.everyone.net/selectmail?campaign=tag