2.5" to big?

[az_sv6]

is my vz alloy(190) going to lose power with a 2.5" exhaust?

[nathanVY]

i'd like to know the answer to this two, are we better off going with a 2 1/4" system for a v6?

[MattMarkey]

hey guys. i recently got a redback twin 2 1/2 system. no loss of power, same bottom end performance, top end noticed a bit more ticker but nothing to brag about, do the complete system if u want real performance. the only thing is it sucks cause all up for a decent system ur looking at around 2 Grand unless u know people. i got the redback system with no rear resonator(for more sound) and it was $600. i think if the rear resonator was in it u'd notice a bit more power but still nothing to brag. also supercat has a twin 2 1/2 into a 2 1/4 tailpipe, that could be betta then 2 1/2 all the way thru. about $600 for them pipes too. pacemaker 5069 headers would make a fair bit of difference and maybe balistics 200cell cats. would sound a dream too =).
thats my 2bobs worth anyway. hope i helped u a bit..

[az_sv6]

yeah wasn't looking for a performance boost from an exhaust but didn't wanna lose power ether.
i was thinking about the twin 2.5 into a 2 1/4 without the rear res.
and does any1 have any prices for headers and extractors?

[VZ-Rob]

I got the SS twin 2 1/4 noticed heaps more power ! and better fuel ecconomy

[az_sv6]

more power eh? and thats from the cats back? did you fit it yourself?

i think iv asked this before but the stock pipes are 2 1/4 already whats the diff?

[MattMarkey]

stock pipes have flat spots and shit.

[PaulSV6]

stock pipes have flat spots and shit.

English mate.............

[MattMarkey]

sorry lol..
the pipes are made smaller to fit thru the suspension and crossmember. so its a 2 1/4" but goes smaller thru the crossmember at the front and the suspension at the rear and restricts power.. it probly goes to a 2" thru them places.

[DrZ]

I currently run a 2.5" Cat back system. Seriously, no loss in power mate. If anything it works out better, I noticed a drop in fuel to the 100 (was initially 12.3-12.5 now approx 11.8) to mate and sounds great.
Unfortunately its not a twin :'( but am thinking of the upgrade.

However I do drive a VS.

[MattMarkey]

yeah i had a vs running a 21/2" system, bloody dream that car was to drive and the power was good. unfortunately that came across a volvo and went bye bye lol.
b

[showxpony]

hey guys. i recently got a redback twin 2 1/2 system. no loss of power, same bottom end performance, top end noticed a bit more ticker but nothing to brag about, do the complete system if u want real performance. the only thing is it sucks cause all up for a decent system ur looking at around 2 Grand unless u know people. i got the redback system with no rear resonator(for more sound) and it was $600. i think if the rear resonator was in it u'd notice a bit more power but still nothing to brag. also supercat has a twin 2 1/2 into a 2 1/4 tailpipe, that could be betta then 2 1/2 all the way thru. about $600 for them pipes too. pacemaker 5069 headers would make a fair bit of difference and maybe balistics 200cell cats. would sound a dream too =).
thats my 2bobs worth anyway. hope i helped u a bit..

I have the same thing on my VZ Calais, i agree exactly with your observations too. Top end is slightly better, but definately no power loss, if anything theres a slight gain. plus the redback and 2.5inch sounds nice a deep. a bit of drone, but for a 6, i dont think theres a better combo.

[VzVzVz]

I'm about to fit a 2.5 inch catback exhaust to my VZ, will it fit on the origional cats? I don't want to buy it and find that I can't fit it.

[MattMarkey]

it will fit the original cats its all good.

[MattMarkey]

I have the same thing on my VZ Calais, i agree exactly with your observations too. Top end is slightly better, but definately no power loss, if anything theres a slight gain. plus the redback and 2.5inch sounds nice a deep. a bit of drone, but for a 6, i dont think theres a better combo.

so urs is without the rear resonator too?

[showxpony]

so urs is without the rear resonator too?

Mines actually with a rear resonator... But i was told it makes no difference to anything but sound... Just to reduce the raspy-ness. I had a listen to it with a resonator and without, i preferred without as it was a bit deeper.

[MattMarkey]

yeah mines much deeper and louder. my mate has a vz sv6 with the same system as you have. it sounds really good but very very quiet i think. but still sounds awesome.

[ALIII]

Just got a quote from dandy exhaust, twin 2 1/2 from the cat back $550 fitted for VZ SV6, another place quoted $620 fitted. Do your shopping around, ask for quality product (ie redback etc) and always ask how much the full system would cost, and the cost of step by step of the exhaust system.

Get the job done at different places if need be, some places charge more for different jobs.

TIP: if you want the job done cheaper, ask if they make their own parts in house and buy their name brand which will cut the cost by at least 1/4.

hope this helps

[showxpony]

i got mine done in stainless steel with a redback muffler for 350... done at tidd bros in spotswood, vic.

[showxpony]

yeah mines much deeper and louder. my mate has a vz sv6 with the same system as you have. it sounds really good but very very quiet i think. but still sounds awesome.

The resi i have is a hotdog, it was just as loud with the resi as it was without it, just a different tone. Mines pretty loud, especially under load, has a nice burble on idle too.. But it stills sounds like a 6 haha

[ALIII]

i got mine done in stainless steel with a redback muffler for 350... done at tidd bros in spotswood, vic.

what did you get done exactly?

EDIT:

I just gave them a call, a guy by the name of Fred (lovely guy to talk to lol) gave me some quotes

$440 - no name
$500- full mandrel cat back exhaust
$550 - APE tested cat back sports exhaust system

so my question again, what did you get put on for $300? a plastic tube? lol

[Rossbx]

I have the same thing on my VZ Calais, i agree exactly with your observations too. Top end is slightly better, but definately no power loss, if anything theres a slight gain. plus the redback and 2.5inch sounds nice a deep. a bit of drone, but for a 6, i dont think theres a better combo.

Mine was a bit droney with the 2.5" Redback zorst when first fitted (VP Sedan) so I fitted a 12" hotdog where the resinator usually sits and now the drone is almost unnoticeable.

[ALIII]

Hey all, i have called over 15 places this morning trying to solve this issue.... so far here are the answers i have come up with.

1) Buying the mandrel bent system or redback system from a retailer and getting it fitted at a exhaust shop did not have much of an impact on the price. This mean that most of the installers only charge for labor on the job.

2) HUGE CONTRADICTIONS from one 'performance shop' to another. Some claim that they would not pay for anything unless it was mandrel bent, because your loosing a lot of the 'purrr' with a normal system. Others say there is no difference between a 'redback' system normally bent and getting one mandrel bent claiming that 'it is a waist of time and money'.
Please help with referenced answers to this question please?

3) some places almost recommended the 2 1/2 system over anything else, however other places said that the 3.6L V6 didnt have enough balls to support the 2 1/2 and would do nothing but cause too much noise and a headache for the driver. If you chose to go for the 'single 2 1/2' that was fine but the twin was too much.


who ever has either system, or has any complaints please give us your input!!!!!

EDIT:
Al's Custom Exhausts claims that a twin 2.5 is guaranteed to put you over the noise limit and loose your roadworthy, not even the slightest chance it would be under. thought id add this in for you

[showxpony]

what did you get done exactly?

EDIT:

I just gave them a call, a guy by the name of Fred (lovely guy to talk to lol) gave me some quotes

$440 - no name
$500- full mandrel cat back exhaust
$550 - APE tested cat back sports exhaust system

so my question again, what did you get put on for $300? a plastic tube? lol

Lmao... yeah fred! he's a top bloke! Well i got mine so cheap, i think, because the 2 into one 2.5inch piping wasn't brand new, but the redback muffler was. I paid 440 all up because the tip i chose was 90 dollars. Maybe i got lucky? haha, i love the job he did. My mate got his FG XR6 done there with an xforce muffler for 440... Maybe go in there and sweet talk him, he's an awesome bloke, willing to do good deals too from my experiences...

[showxpony]

Hey all, i have called over 15 places this morning trying to solve this issue.... so far here are the answers i have come up with.

1) Buying the mandrel bent system or redback system from a retailer and getting it fitted at a exhaust shop did not have much of an impact on the price. This mean that most of the installers only charge for labor on the job.

2) HUGE CONTRADICTIONS from one 'performance shop' to another. Some claim that they would not pay for anything unless it was mandrel bent, because your loosing a lot of the 'purrr' with a normal system. Others say there is no difference between a 'redback' system normally bent and getting one mandrel bent claiming that 'it is a waist of time and money'.
Please help with referenced answers to this question please?

3) some places almost recommended the 2 1/2 system over anything else, however other places said that the 3.6L V6 didnt have enough balls to support the 2 1/2 and would do nothing but cause too much noise and a headache for the driver. If you chose to go for the 'single 2 1/2' that was fine but the twin was too much.


who ever has either system, or has any complaints please give us your input!!!!!

EDIT:
Al's Custom Exhausts claims that a twin 2.5 is guaranteed to put you over the noise limit and loose your roadworthy, not even the slightest chance it would be under. thought id add this in for you

Twin would definately be too much... i have 2.5inch dual piping that goes immediately into 2.5inch single right out so there is some compression... The 3.6s definately need some back pressure, theyre not emitting that much exhaust...