Author Topic: got a 2.5" exhaust today... with interesting results  (Read 3801 times)

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Offline noss

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i wasnt going to post anything on my new exhaust, but, on my way home, i noticed some interesting things that differs from other people experience. my exhaust is 2.5" from the cat back, with no resonators and a straight thru muffler which i already had..

  • i already had a 2.5" straight thru muffler installed (from a mates rates exhaust that fell through) and suprisingly, even though i now have a 2.5" exhaust with no resonators, the exhaust doesnt seem to be much louder louder if at all. however, there is now a raspy noise when i'm on full throttle between about 3000-4500rpm but that doesnt really bother me.
  • for the last few months, my idle has been quite rough. while idling my car sounded like a cat purring, with the rpm constantly varying 50-100 rpm. my idle is now rock solid. sits on 850rpm and doesnt budge. no more cat pur.
  • torque has increased. yep. thats right. increased. and it kicks in at much a lower rpm now. and dramatically too. it gave the seat of the pants dyno and the gut-o-meter (that feeling you get when you take of quickly) a real surprise. definately thumbs up material. of course, the gut-o-meter gets used to this sensation of more torque over time & it cries for more mods to be made so it can feel queasy again. most other people who have fitted a larger diameter exhaust have experienced losses in torque. this is the part i'm most intrigued about.

so in the end, i'm quite pleased. better idling. more torque, and not overly loud. but i guess everyone here already has an exhaust. so my post is probably pointless. for newbies with stock exhausts, get it done.
« Last Edit: Mar 15, 2004, 11:12PM by noss »

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Offline SSS

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Re:got a 2.5" exhaust today... with interesting results
« Reply #1 on: Apr 11, 2003, 09:51PM »
Add another thing to do to my list. 2.25" though with a 2.5" cat.
Noss, you've never been bothered by the piggies with your old setup?

Offline BEEFY_1600

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Re:got a 2.5" exhaust today... with interesting results
« Reply #2 on: Apr 11, 2003, 10:37PM »
Noss im looking for a new exaust ,so do your reconed a 2.25 to the cat then a 2.5 from their i just whent in my mates svd pulsar. It chrips from first to second  :o. I want this cause its cool and good for wank factor so if i can aceve this with this mod i will be very happy :) :) :) :D :D

Offline Tim-E

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Re:got a 2.5" exhaust today... with interesting results
« Reply #3 on: Apr 11, 2003, 11:16PM »
my stock magna chirps from 1st to 2nd.

gotta say, i just love chirping!  8)
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Offline noss

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Re:got a 2.5" exhaust today... with interesting results
« Reply #4 on: Apr 12, 2003, 03:20AM »
sssgtr:  i was never hassled by police with my old setup. after driving tonite a little bit, i think the new exhaust is actually a little louder.

gli_timmy/beefy: i've chirped on the 2nd-3rd change once or twice  ;D


beefy - i have 2.5" from the cat back, not 2.25" the way it all works out is that yes, it connects to the  catalytic converter and replaces the existing exhaust from the cat back.

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Re:got a 2.5" exhaust today... with interesting results
« Reply #5 on: Apr 12, 2003, 04:08AM »
i got a 2 inch exuat u recon i should change to 2 1/4 ??>????

Offline BEEFY_1600

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Re:got a 2.5" exhaust today... with interesting results
« Reply #6 on: Apr 12, 2003, 11:47AM »
noss What are u saying im  ???confused have u got a 2.5 from your extractors back as afull system or have u got a 2.25 from your extractors to your cat then 2.5  or is it stock to the cat then a 2.5  ???

Offline Tim-E

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Re:got a 2.5" exhaust today... with interesting results
« Reply #7 on: Apr 12, 2003, 04:35PM »
i've chirped on the 2nd-3rd change once or twice  ;D

hmmmm haven't done that one, i think i gotta try harder!  :P
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Offline Nizzan

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Re:got a 2.5" exhaust today... with interesting results
« Reply #8 on: Apr 12, 2003, 06:54PM »
beefy - im with you, confused  ???  ???

Offline jimsair

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Re:got a 2.5" exhaust today... with interesting results
« Reply #9 on: Apr 13, 2003, 11:43AM »
I think the exhaust headers just about go straight into the cat , the term cat-back exhaust generally means you don't touch anything before the cat converter.

Offline aussie-gli

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Re:got a 2.5" exhaust today... with interesting results
« Reply #10 on: Apr 15, 2003, 01:18AM »
It would be really interesting to see a dyno before and after...
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Offline Pinsair

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Re:got a 2.5" exhaust today... with interesting results
« Reply #11 on: Apr 29, 2003, 02:19AM »
Quote
i got a 2 inch exuat u recon i should change to 2 1/4 ??>????

yeh i also got a 2", thats what genie recomended, do u think its worth getting a 2 1/4"??

Offline Resin

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Re:got a 2.5" exhaust today... with interesting results
« Reply #12 on: Apr 29, 2003, 11:46AM »
.....
Quote
yeh i also got a 2", thats what genie recomended, do u think its worth getting a 2 1/4"??


....i dunno ....mine is 2 inch all the way through from headers to tip ....and that made heaps of diff .....low end torque more power all the way through ....i get heaps better fuel economy on freeway driving ....at least a litre below wat i used to get ...prob about 9 litres to 100km .....about the same to more city ...cause with the extra power and noise u tend to gun it more .....hehehehehe ...

i do have headers aswell....still got cat ....and two resonators ....and its loud ...so id be interested to see wat noss's sounds like!!!


Quote
I think the exhaust headers just about go straight into the cat , the term cat-back exhaust generally means you don't touch anything before the cat converter.


not quite there is a straight peice of exhaust pipe between the headers and cat with this thing? what the crap is it called ....meshy metal thing ....well if it comes to me i will mod this thread.

Offline Resin

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Re:got a 2.5" exhaust today... with interesting results
« Reply #13 on: Apr 29, 2003, 11:47AM »
oh yea ...wat is chirping??

Offline noss

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Re:got a 2.5" exhaust today... with interesting results
« Reply #14 on: Apr 29, 2003, 12:07PM »
oh yea ...wat is chirping??


chirping is when you get the tiniest bit of wheel spin as you've changed gears, so you change to 2nd, and you get a little chirp, and sometimes in 3rd, you'll get a chirp.


Quote
not quite there is a straight peice of exhaust pipe between the headers and cat with this thing? what the crap is it called ....meshy metal thing ....well if it comes to me i will mod this thread
Quote

its flex pipe. cat back doesnt include the replacement of the flex pipe. i think its about $300 to upgrade. its there because of the movement of the engine in a front wheel drive car.

Quote
i do have headers aswell....still got cat ....and two resonators ....and its loud ...so id be interested to see wat noss's sounds like!!!

yeah, its kinda loud.

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Offline RichTRX

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Re:got a 2.5" exhaust today... with interesting results
« Reply #15 on: Apr 29, 2003, 12:59PM »
I get chirping when I change from neutral to first  :P
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Offline Resin

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Re:got a 2.5" exhaust today... with interesting results
« Reply #16 on: Apr 29, 2003, 04:37PM »
Quote
chirping is when you get the tiniest bit of wheel spin as you've changed gears, so you change to 2nd, and you get a little chirp, and sometimes in 3rd, you'll get a chirp.


oh right yea i get that i just never heard of a name given to it before !....it can be seriously weird in the wet

Offline mitza

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Re:got a 2.5" exhaust today... with interesting results
« Reply #17 on: Apr 29, 2003, 04:59PM »
Also known here inm syd as "pulling seconds' going from 1st gear to second, or maybe even "pulling thirds"

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Re: got a 2.5" exhaust today... with interesting results
« Reply #18 on: Jun 3, 2004, 06:12PM »
I get chirping when I change from neutral to first  :P

lol i supose it could be done from neutral to reverse too :D
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Re: got a 2.5" exhaust today... with interesting results
« Reply #19 on: Jun 3, 2004, 06:23PM »
resonators will get rid of the raspy sound.
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