[s-cars] urs4 exhaust system modifications

[mlp]

Actually Krist, if what you want is more engine noise, I think the answer
can be pretty simple ~ use a 3 & 1/2" (3.5) round or oval, your choice, tube
for every thing from the down pipe back.  You don't say where your "I don't
need cats" country is located, so it's hard to know what options you may
have available for mufflers &/or resonators,..... and if they come in inches
or mm's.  

The usual options for most of the list, which seems to me to be
predominantly located in the US,  have been either Borla or Magnaflow (US
brands, I think) units for those who haven't just gone with the simple full
Stromrung (downpipes & muffler) systems.

Eliminating the "resonator" (the little extra mufflers that sit between the
cats and the large rear most "muffler") IME seemed to affect "resonance"
(that annoying "drone") one gets at certain more or less fixed rpm ranges
(ie. @ 3,000 IME)  

I find the resonance "drone" particularly annoying, and personally would
rather keep the resonators to avoid a 3,000 (a pretty normal highway
cruising rpm range) drone.

Last, the thing to keep in mind, is if the Mounties can hear you coming
....., they're likely to be looking for something when you go by.

Mike "trying to find a way to quite the 3.5" system" Pederson

>-----Original Message-----
>From: s-car-list On Behalf Of Krists
>
>Hello guys!I'm searching for info about better urs4 exhaust 
>system (sound+performance)+keep in mind that there is no need 
>for extra co2 emission tests in my country!For now I have 
>cut-out the center muffler only..the sound is a little better 
>now but I want a bit louder (not so loud as with no exhaust 
>but the sound with the cats only is awesome,only the fact, 
>that drill around 3k rpm is painful) 
>I found a topic in urs4 forum that original downpipe isn't so 
>bad for further upgrades, so I need to know what to do with 
>downpipe-back system?So I came with two ideas: 
>
>1.Replace downpipe-back with 3" pipe +high-flow cat and 
>alternative rear muffler (obx,ractive,remus or smth. else) - 
>so there I need to cut the downpipe before it splits into two pipes! 
>
>2.Much simpler - Replace original cats with needed size 
>high-flow cats, let original pipes stay and replace the rear muffler 
>Are there any chances to lost the performance if rear muffler 
>is with one inlet pipe only,like there is necessary to weld 
>two exhaust pipes together again,in case if I can't found an 
>exhaust with two inlet pipes?) 
>Please verify some of my thinkings! Thanx!