Australia Bi-Modal Exhaust Updates

[pdmit]

Has anybody had the xforce varex bi modal fitted and if so their opinion on it Thanks Paul

 

[Stinger GT SS]

I’m also looking at it,I was quoted x-force cat back bi-modal $2200 installed also check out YouTube vid Tony’s Mufflers sounds ok, & cheaper than Kia offering.

 

[sticks]

xforce has add two resonators to cut out the drone. If you add the odb11 connection to make it automatic it will cost about the same as kia but you will have the increase in kw's and the better sound with more control plus gps control. xforce has sold a threw of them. They are going to make a video in the near future.

 

[pdmit]

Sounds to me like the go been told you can just use a switch to start and add the app later if you want

 

[ShannonC]

On the weekend my Bi-Modal became louder in Comfort mode...I think to myself "that's interesting" and didn't give it another thought.
Started it up in the morning to go on the NSW drive and sound was normal except for a metallic rattle. I didn't think too much of it as car was performing normally except for that annoying rattle which came and went. At one of the drive stops I investigated further and found the left side electronic actuator that attaches to the flap shaft had parted company.
This what it looked like when first spotted

Went to Dealer this morning and they immediately put it on a hoist and unplugged the actuator. The flap shaft is clearly shown and has free movement so that was the "rattle" I was hearing.

Here's a pic of the right hand side. There's a retaining pin in the centre of the bracket that apparently holds thing together. There are a few possibilities of what happened to the left hand one.... a. It wasn't installed correctly b. it wasn't installed c. it broke....Dealer hadn't heard of this happening previously so there's no proper explanation.


One would think it would be a simple case to source another pin, but not so. Dealer says KIA would insist on a "genuine" pin to maintain warranty integrity which is a reasonable statement but guess what......the pin may not be available as a spare part. Apparently the system comes pre-assembled from the manufacturer so all the dealer does is bolt on and wire. Dealer stated KIA might want to replace the entire system!!! OMG.
The issue has been escalated and I'm now waiting on a decision. In the meantime my Stinger sounds like it's sports mode most of the time and that rattle at low revs continues.

 

[Stinger GT SS]

On the weekend my Bi-Modal became louder in Comfort mode...I think to myself "that's interesting" and didn't give it another thought.
Started it up in the morning to go on the NSW drive and sound was normal except for a metallic rattle. I didn't think too much of it as car was performing normally except for that annoying rattle which came and went. At one of the drive stops I investigated further and found the left side electronic actuator that attaches to the flap shaft had parted company.
This what it looked like when first spotted
View attachment 14392
Went to Dealer this morning and they immediately put it on a hoist and unplugged the actuator. The flap shaft is clearly shown and has free movement so that was the "rattle" I was hearing.
View attachment 14391
Here's a pic of the right hand side. There's a retaining pin in the centre of the bracket that apparently holds thing together. There are a few possibilities of what happened to the left hand one.... a. It wasn't installed correctly b. it wasn't installed c. it broke....Dealer hadn't heard of this happening previously so there's no proper explanation.

View attachment 14393
One would think it would be a simple case to source another pin, but not so. Dealer says KIA would insist on a "genuine" pin to maintain warranty integrity which is a reasonable statement but guess what......the pin may not be available as a spare part. Apparently the system comes pre-assembled from the manufacturer so all the dealer does is bolt on and wire. Dealer stated KIA might want to replace the entire system!!! OMG.
The issue has been escalated and I'm now waiting on a decision. In the meantime my Stinger sounds like it's sports mode most of the time and that rattle at low revs continues.
View attachment 14394

So they just left the acuator hanging there?

 

[ShannonC]

No, there's a cable connector so it easily detaches. I just couldn't get to it on Sunday otherwise would have disconnected.

 

[ShannonC]

The Dealer called and and said KIA want to replace the entire exhaust. Said will take approx 2 weeks to get in.

 

[Stinger GT SS]

The Dealer called and and said KIA want to replace the entire exhaust. Said will take approx 2 weeks to get in.

Cannot complain about that sort of service, good news.

 

[Byrnzie]

Hi Everyone,

Took delivery of my micro Blue GT a few days ago; am loving it. Just wondering if anyone in Melbourne has actually heard this new exhaust as yet? Is it actually available to be ordered and fitted? Would want to hear before I commit to getting it.

Thanks for any info you have.

Hey Jamie, I've driven a couple of demos with the bimodal exhaust, sounds heaps better than stock that's for sure.
i'm waiting on delivery of my new Stinger, micro blue, bimodal, tinted windows and ceramic paint protection, can't wait.

 

[Ozstung]

Hey Jamie, I've driven a couple of demos with the bimodal exhaust, sounds heaps better than stock that's for sure.
i'm waiting on delivery of my new Stinger, micro blue, bimodal, tinted windows and ceramic paint protection, can't wait.

Well done byrnzie you are amongst others with good taste. Have a look around our place and ask questions if you like. 1 question to you first. What state are you from? Would you mind putting that in your location discription thanks.

 

[Byrnzie]

Has anyone had a dyno done or know of any before and after results with the Kia bi-modal exhaust system ?

 

[Ozstung]

Has anyone had a dyno done or know of any before and after results with the Kia bi-modal exhaust system ?

There are no power gains from the Bi modial exhaust. It is an axle back exhaust.

 

[Stinger 512HP]

It sounds ok but I think it can be a little deeper. I wonder if anyone has gone to a specialist exhaust centre for a quote. Would a non factory bi-modal exhaust affect performance and tuning?

I had my new GT sent direct to Jonny TIG in Adelaide, this guy has built an amazing 4 inch single system that needs to be heard to be believed.
He does a performance upgrade with the 4inch, bigger inter cooler and an out of this world CAI kit for $5990 which delivers an extra 92kw at the rear wheels.
Keep the $2,300 Kia will charge for a system that delivers no extra HP and get the real thing.

 

[Byrnzie]

There are no power gains from the Bi modial exhaust. It is an axle back exhaust.

Ahh never mind.
Thanks for the response.
Still a pretty good sound considering.

 

[PxbVic]

It sounds ok but I think it can be a little deeper. I wonder if anyone has gone to a specialist exhaust centre for a quote. Would a non factory bi-modal exhaust affect performance and tuning?

Hey AV8R, the bimodal exhaust would have zero effect on performance because it's only the rear resonators, the valves only allow a small bypass of exhaust gas past the rear resonators, to improve sound. This is the reason I'm not interested in a $2600.00 option that only improves the sound.

To improve performance and sound you would have to change the exhaust from at least the Catalytic converter back and probably replace the catalytic converter to a better breathing one. (Cant wait to get my car on a hoist so I can dissect the exhaust system). I can fabricate exhaust systems. I could easily replace the stock rear resonators and pipes for $500 and make the car sound better than with the bi-modal exhaust, and probably pick up a few extra KW in the process if done right. but I'm only talking less than 5KW here for the rear resonators and deepending on the ECU, Engine MAP's, fly-by-wire throttle, and turbo waste gates, a full CAT back exhaust could realise an extra ~15KW without other modifications.

To really improve performance, then you would be looking at the collectors from the turbos to the catalytic converter also to see if there would be gains to open these up from stock.

Then things start to get exotic, Air box repalcements, looking at the intercooler and flow through that, ECU Maps, throttle demand and position, boost pressures controlled by the turbo waste gates, Cam timing (variable valve timing) all adjustable via the ECU Maps.

I've been looking into this, and there are a couple of cars with about $3000,00 in mods, bolt on and ECU maps, that are getting north of 300KW at the rear wheels. The stock car would be about 220KW after drive train losses.

This car has to meet ADR sound laws to keep it under 90db, and the stinger is very quiet, I'll be testing this when I get mine to see what the potential is to push more performance and better sound.

I don't know what the size of the exhaust is stock, but a good well sorted 2.5" mandrel bent exhaust would achieve this without the need for bi-modal valves and with well placed resonators, and it would sound fantastic. I'm not sure with a 3.3ltr V6, if you would be able to get below the safe 90db with a 3" exhaust system, but we will see.

There are several tuners in Melbourne who are fabricating CAT back exhausts for this car that really sound way better than the bi-modal, but also make the car breath better and improve performance. These can be had for $1200 to $1500.

 

[Ozstung]

Hey AV8R, the bimodal exhaust would have zero effect on performance because it's only the rear resonators, the valves only allow a small bypass of exhaust gas past the rear resonators, to improve sound. This is the reason I'm not interested in a $2600.00 option that only improves the sound.

To improve performance and sound you would have to change the exhaust from at least the Catalytic converter back and probably replace the catalytic converter to a better breathing one. (Cant wait to get my car on a hoist so I can dissect the exhaust system). I can fabricate exhaust systems. I could easily replace the stock rear resonators and pipes for $500 and make the car sound better than with the bi-modal exhaust, and probably pick up a few extra KW in the process if done right. but I'm only talking less than 5KW here for the rear resonators and deepending on the ECU, Engine MAP's, fly-by-wire throttle, and turbo waste gates, a full CAT back exhaust could realise an extra ~15KW without other modifications.

To really improve performance, then you would be looking at the collectors from the turbos to the catalytic converter also to see if there would be gains to open these up from stock.

Then things start to get exotic, Air box repalcements, looking at the intercooler and flow through that, ECU Maps, throttle demand and position, boost pressures controlled by the turbo waste gates, Cam timing (variable valve timing) all adjustable via the ECU Maps.

I've been looking into this, and there are a couple of cars with about $3000,00 in mods, bolt on and ECU maps, that are getting north of 300KW at the rear wheels. The stock car would be about 220KW after drive train losses.

This car has to meet ADR sound laws to keep it under 90db, and the stinger is very quiet, I'll be testing this when I get mine to see what the potential is to push more performance and better sound.

I don't know what the size of the exhaust is stock, but a good well sorted 2.5" mandrel bent exhaust would achieve this without the need for bi-modal valves and with well placed resonators, and it would sound fantastic. I'm not sure with a 3.3ltr V6, if you would be able to get below the safe 90db with a 3" exhaust system, but we will see.

There are several tuners in Melbourne who are fabricating CAT back exhausts for this car that really sound way better than the bi-modal, but also make the car breath better and improve performance. These can be had for $1200 to $1500.

The problem so far with all the aftermarket exhausts for the Stinger is the dreaded drone factor. The bi modial was engineered to stop this. I guess that is a good selling point. I went aftermarket and suffered the consequences.

 

[ShannonC]

The problem so far with all the aftermarket exhausts for the Stinger is the dreaded drone factor. The bi modial was engineered to stop this. I guess that is a good selling point. I went aftermarket and suffered the consequences.

Plus you have a full Kia warranty.

 

[PxbVic]

Plus you have a full Kia warranty.

OFC the warranty, hence why it wont be altered for the next 3 years, but after that, I'm not fussed. Yes it has 7 years, and you know what kudos to Kia for putting the industry on notice. But the reality is after 3 years I'm going to work.

Also if you replace the rear pipes and resonators with others it wouldn't affect the warranty because you could simply state that they were damaged and replaced with comparable after market parts that DO NOT affect the performance. Under Australian Consumer Law you would be protected, just as a dealer cannot force you to use a KIA Oil Filter, as long as the part is of comparable quality the law protects the consumer. Again they would not affect the Performance, but can easily make it sound better.

 

[PxbVic]

The problem so far with all the aftermarket exhausts for the Stinger is the dreaded drone factor. The bi modial was engineered to stop this. I guess that is a good selling point. I went aftermarket and suffered the consequences.

Yeah agreed, however full performance exhaust will always be a compromise, I've heard some that drone and some that don't. If and when I decide to do anything with my car, I will be doing the work myself, including fabricating the exhaust, I can make good power without droning, it a bit of an art to tuning exhaust but understand after market performance parts makers are selling performance so the trade off is exhaust drone. Come the time I do it, it won't be about out and out performance, it will be to augment a great car and still retain the spirit of GT. That is Luxury, Comfort, Performance, and Style. The sound is important but not at the expense of aural comfort. If I wanted a noisy beast I'd buy a car that already was a noisy beast.