Exhausts

[hkogti]

Anyone seen heard or used a MTM catback exhaust?

What other company make a bolt on catback exhaust?

How did it sound and how much is it?

Miltek suppose to have one for he GTi but then is now under redevelopment when i enquire about it....

[99gti]

Give Mila from TCCA motorsport a call, he's one of our sponsors. I'm sure he can organise for you to have a listen to one. Otherwise there is also APR who do an exhaust for the polo too.

[Sharkie]

Catback exhausts on the Polo make virtually no difference in power. It only makes noise....

For any real benefit you will need to replace the downpipe and cat.

[GT3]

Catback exhausts on the Polo make virtually no difference in power. It only makes noise.....

:confused: what are you basing that assertion on? ..with the exception of Tim's dp (3" dp with high psi tune), what increase in power did the upgraded down pipes make at the Brisbane dyno day? ..and did a full system make a difference to mine?

Speaking of noise, have you ever heard an MTM system? ...sound brutal :)

[VW GTI]

:confused: what are you basing that assertion on? ..with the exception of Tim's dp (3" dp with high psi tune), what increase in power did the upgraded down pipes make at the Brisbane dyno day? ..and did a full system make a difference to mine?

Speaking of noise, have you ever heard an MTM system? ...sound brutal :)

There was 1 downpipe at the Brisbane dyno day and there were issues with my car. Leave the dyno talk until the next dyno day which is mid August.

The second half of the Polo system is not very restrictive (in comparison to the downpipe/cat), especially the newer ones as they only have 1 muffler.

[DubSteve]

http://www1.istockphoto.com/file_thumbview_approve/863840/2/istockphoto_863840_search_button.jpg

[hkogti]

I love to make noise... Sorry... :driver:

cant find any clips on youtube about mtm exhaust on polo...

Hows it compare with MIlltek?

Is TCCA open on Sat?

Hopefully MTM exhaust is not so dear so my tax return can cover one...

I know it might not make any difference in power, but is should help the boost to come in earlier...

I would like to get a quad exhaust, but realise it i so much trouble and due to the fact that no big power gain, i give up on that...

[Sharkie]

..and did a full system make a difference to mine?

I'm not saying full exhaust ... I'm only saying catback has no benefits except for sound....

Downpipe should make a difference and full even slightly more.

I plan to do full this year still.

[GT3]

..you wanna hear MTM exhausts? check out this RS4 :cool46:

http://uk.youtube.com/watch?v=b9zgnPqvzn4

[VW GTI]

Or this Milltek R32 :banana:

http://www.youtube.com/watch?v=6e4XvqGvjrQ

[hkogti]

I saw them, they all sound hot, but i m 200% sure it sound different in the polo...

I have found that remus is doing titan tip exhaust called wild label, not sure can that specially make one for me...

[Quest]

I saw them, they all sound hot, but i m 200% sure it sound different in the polo...

I have found that remus is doing titan tip exhaust called wild label, not sure can that specially make one for me...

There is only one guy atm in NC who's got a MTM Polo GTI (ECU + catback) See it here (http://www.mtm-online.de/en/index.php?nav=3&FZID=POLO110&Kitnum=mpol150200fx) and here (http://www.octane-nc.com/html/poloGTI3.html).

I can try to record a sound clip if you want....but MTM is very expensive as you can see, it's 1094 € just for the cat-back !!

[callen]

Please excuse my lack of knowledge regarding the exhaust sytem on our polo GTI's but isn't the stock exhaust on the GTI resonated so if you were just after a deaper raspier sound couldn't you just remove the resonator???:confused:

[Golf Houso]

Please excuse my lack of knowledge regarding the exhaust sytem on our polo GTI's but isn't the stock exhaust on the GTI resonated so if you were just after a deaper raspier sound couldn't you just remove the resonator???:confused:

The resonator provides not only sound deadening but also character in the sound. By removing it your making the car sound louder but not necessarily better, your best bet is to replace it with a lighter less restrictive muffler, also the drone will be quite bad on the highway.

[GT3]

For any real benefit you will need to replace the downpipe and cat.

The Polo GTI exhaust is good for stock, but when power is increased, upgrading both the DP and rear muffler produces real benefits.

[Timbo]

We have been through this -- many, many times. Search is your friend. :)

[GT3]

Tim - yours is a custom 3" dp and you're running 19 psi boost, ..think you should avoid generalising about how the mod works on all Polo GTIs.


...:nana: :brutal::biggrin:

[Timbo]

Actually, it peaks at 18psi, and averages 16psi through the powerband, FWIW :duh: But that wasn't the point of my post at all.

My point is that we have posts revisiting issues. There's a very hand FAQ and DIY that PoloGTI spent quite a bit of time putting together, which centralises most of the information being sought, and to which new owners should be encouraged to refer. :)

[hkogti]

Anyone knows whats the diameter of the standard exhaust?

As most of your guys think that the stock exhaust is pretty free flowing, do you guys thinks its ok to leave themiddle pipe stock and change the rear box for sound and dump pipe for power? Or it will yield significant power with the replacement mid pipe?

[Blitzen]

Anyone knows whats the diameter of the standard exhaust?

As most of your guys think that the stock exhaust is pretty free flowing, do you guys thinks its ok to leave themiddle pipe stock and change the rear box for sound and dump pipe for power? Or it will yield significant power with the replacement mid pipe?

The stock diameter is 2 1/4 inches. The middle assembly on mine(07 model) is the Catalytic Converter, then its free flowing to the fear muffler and twin pipes...I have no middle muffler, but I think early model Polo GTI's do(Don't hold me to that!!).

[GT3]

...then its free flowing to the rear muffler and twin pipes.

The rear muffler isn't free-flowing, it has 3 chambers so it's definately a restrictive muffler.

[Kai]

Hacksaw!..

[Blitzen]

The rear muffler isn't free-flowing, it has 3 chambers so it's definately a restrictive muffler.

Like I said in my original post "...It is free flowing to the muffler...":duh:
Not the muffler itself...

[Timbo]

The most restrictive part of the stock exhaust system is the dump pipe bend into the cat. It's 2.25", and at that bend, the width is effectively less than 2". That's why installing a custom dump pipe (say, 3" to the cat) or something like the APR dump and hi-flow cat liberates good power on chipped cars.

[hkogti]

So that the middle silencer can be ignored and just get a dump pipe and rear exhaust? Isnt that bigger middle pipe helps too? As the stock one is only 2.25", a 3" would be nice isnt it?

[h100vw]

So that the middle silencer can be ignored and just get a dump pipe and rear exhaust? Isnt that bigger middle pipe helps too? As the stock one is only 2.25", a 3" would be nice isnt it?

You don't need to go as big as 3inch, in the system, it doesn't help. Then you can start to experience booming, I have a 3 inch turbo back system on my A3 and I wish I'd not gone so big.

The std turbo spooled quick mind!!

Gavin

[Timbo]

So that the middle silencer can be ignored and just get a dump pipe and rear exhaust? Isnt that bigger middle pipe helps too? As the stock one is only 2.25", a 3" would be nice isnt it?
IMHO, just a dump is all you need, but others seem to think otherwise

[GT3]

You don't need to go as big as 3inch, in the system, it doesn't help. Then you can start to experience booming, I have a 3 inch turbo back system on my A3 and I wish I'd not gone so big.

I've upgraded the exhaust systems on both a Polo GTI and A3T using different configurations on each. Here's what I've learnt:

If you're going for a full system, then 2.5" from start to end will give you the best balance between low/mid/high end power. ...any bigger than 2.5" on a KO3(S) turbo and you'll lose power and drop boost. This is why Milltek, APR etc etc don't go bigger than 2.5", and their R&D and testing confirms this.

The biggest challenge (and compromise) in designing performance exhaust systems is containing drone. That's why most full systems come with resonators and longish rear mufflers - to keep them quiet. The problem with performance exhausts and "what's the best" is that it's highly subjective, ie the level of noise that's acceptable or desirable. Most performance exhaust manufacturers have little choice but to make them as quiet as possible. This may not suit some where the custom route gives them the freedom to try something else.

In terms of the Polo GTI, the stock system is pretty good (for a stock car). VW were raunchy enough to even remove the middle muffler/resonator after 2006. What keeps it reasonably quiet is that it's 2.25" from start to end, coupled with a rear 3 chambered (restrictive) muffler. For more power and flow, you either can upgrade the down pipe and/or rear muffler. Most opt for the DP which provides the biggest gains power wise, but the rear muffler shouldn't be entirely overlooked as a restriction either.

[Timbo]

Here's some data for people to contemplate. Yes, I know, it's from a dyno -- but it's an Aussie dyno..in fact, I used the same dyno, same fuel,same operator...just different days.

Here's the sheet for my car, stock apart from Revo flash, running on V-Power Racing (which doesn't make much difference anyway...no wonder Shell is pulling it)

http://i176.photobucket.com/albums/w184/timbo_gti/Originalrun-Tim.jpg

This second sheet shows my car, as above, with the addition of a custom 3" dump pipe, fabricated for me by Fyshwick Exhausts (they're technician who know all to know about exhausts -- don't just get any pipe bender to do this work for you)

http://i176.photobucket.com/albums/w184/timbo_gti/JulySydrun100MapAFRTim.jpg

By any measure, the dump liberated 13KwATW. That's more than I have seen even from a full 2.5" system. The biggest restriction is in the dump!

[binnyvo]

Timbo,

How much did it cost you for the 3" downpipe, if you don't mind me asking? Is it similar to the APR one? cause I'm thinking of getting one done.

Cheers, Binh.

[GtI2Go]

how much are the MTM catback exhausts going for?
and where can i get it?

[Timbo]

How much did it cost you for the 3" downpipe.... Is it similar to the APR one?

Mine cost less than $500 to be fabricated and fitted by a very experienced exhaust technician in a well-equipped workshop. Here's my original thread on this mod (http://www.vwwatercooled.org.au/newforum/upload/showthread.php?p=65510#post65510).

Do NOT contemplate this unless you know that the shop has the capabilities and expertise, otherwise you could end up with a mess that costs a lot more to fix.

The APR pipe also includes a high-flow cat, and as such, is a good, oem-like replacement for the whole down-pipe. Guy hadn't developed this when I had my dump made. If I was doing it now, I would probably buy the APR pipe -- provided it worked with my Revo flash -- not much sense in buying a whole new flash just to fit a new down pipe :duh:

[GtI2Go]

thanks timbo...... do you know anyone in the melbourne area who is capble of such a job?

[GT3]

Do NOT contemplate this unless you know that the shop has the capabilities and expertise, otherwise you could end up with a mess that costs a lot more to fix.

Totally agree - if you're contemplating this option, find the best exhaust fitter in your city/state, ...seek a recommendation from those who know the best custom shop/fitter in your area, or you risk ruining your standard exhaust, eg O2 sensor problems, poor clearance etc.

[Timbo]

I wouldn't butcher the OEM cat. That's asking for trouble. It flows more than adequately to handle the turbo, and the consequences -- should the car be put over the pits at some stage -- might be serious.

[GtI2Go]

besides APR/ Volkspower Burwood, Melbourne........ anyone reconmend any other shops fit for polo mod's

[GT3]

I wouldn't butcher the OEM cat. That's asking for trouble. It flows more than adequately to handle the turbo, and the consequences -- should the car be put over the pits at some stage -- might be serious.

Totally disagree :biggrin: It does not flow more than adequately, and leaving the secondary cat would still be legal - removing cats all-together wouldn't be. I've looked through both cats, trust me, the primary cat is very restricted. Since we're on the topic of butchering the stock exhaust anyway, why not do it properly rather than leave the stock primary cat choker on :confused:

[Kai]

Cats dont normally make much of a difference. I gutted my cat and could feel it.

[Timbo]

I've looked through both cats, trust me, the primary cat is very restricted.
It's very difficult to judge the flow of a cat by looking through them; you need to flow test them; good exhaust shops will do this for you.

[hkogti]

OK..

What happen is I am thinking to get a remus exhaust and unfortunately it only comes in rear box, so my plan is to get a APR or milltek downpipe and custom make a 2.75" middle pipe for it.

Is 2.75" too big? or stick with 2.5"?

And apparantly both APR and milltek downpipe are 2.5", anyone have any comments about them?

I know the full exhaust system from APR is cost effective, but i dun like its tip...

[philthy]

Cats dont normally make much of a difference. I gutted my cat and could feel it.

Does the RSPCA know about this? :o

[GTIJNR]

Does the RSPCA know about this? :o

LMAO:bowdown: U mean RTA????