Functional Quad Exhaust

12914 Views 34 Replies 14 Participants Last post by BigMikeISF, Sep 17, 2008

TAndrews

Discussion Starter · May 3, 2008

I posted this on the performance/modification forum, but i thought I would let everyone know about it.

Spent some time yesterday with Dave Borla at Borla Performance Industries. We put my IS-F on a lift and talked about the design of the exhast. He is definitely going to be making it a FUNCTIONAL quad exhast. Those tips will no longer be for show. He understands that the stacked exhast is a trademark of the car, and the design will incorporate that.

we also talked about making 2 production versions of the exhaust. One will completly be a new exhaust system, removing the emissions control. The other will leave the emission control on and will just be replacing the muffler and pipes.

This is all just discussion right now. I've left my car with him for a couple of weeks so they can work on it. I'll keep everyone updated as i know more.

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Msedanman

· #2 · May 4, 2008

TAndrews said:
I posted this on the performance/modification forum, but i thought I would let everyone know about it.

Spent some time yesterday with Dave Borla at Borla Performance Industries. We put my IS-F on a lift and talked about the design of the exhast. He is definitely going to be making it a FUNCTIONAL quad exhast. Those tips will no longer be for show. He understands that the stacked exhast is a trademark of the car, and the design will incorporate that.

we also talked about making 2 production versions of the exhaust. One will completly be a new exhaust system, removing the emissions control. The other will leave the emission control on and will just be replacing the muffler and pipes.

This is all just discussion right now. I've left my car with him for a couple of weeks so they can work on it. I'll keep everyone updated as i know more.

Good news. Can't wait for an update.....

C.

Bakasan

· #3 · May 5, 2008

Thanks TAndrews, keep us updated

TAndrews

Discussion Starter · #4 · May 18, 2008

So I finally picked up my car from Borla Performance Industries. Let me just say they did a fantastic job, unfortunately due to cost and warranty issues associated with removing those 'Quad Exahuast Tips' they were unable to do anything cosmetic to the car.

That being said the sound is AWESOME!!!!!! I was worried that it might sound 'ricey', however they really captured the essence of a large 5litre V8. I had a 450mile drive back to Arizona today, so I really got a chance to put the car through it's paces. What you really notice is the sound at the lower rpms. Before the car was really quite until it hit that magic 4000rpm mark, now you have a deep sounding exhaust just when it's idling. What's great to is it's not obnoxious like you hear on some cars, it's enough to get noticed, however it's not over the top.

When I got back to Scottsdale first thing I did was take it to the carwash. I'm not kidding there must have been about 7 different guys come up to me to ask me about my car, and without even saying anything they all commented on how badass it sounds.

Dave and the guys did a great job. I wasn't able to speak with them on friday, so I havn't gotten any dyno reports yet. As soon as I get them, I'll post them. In terms of performance I can't say I can really feel it, however when you increase the HP by 20 on a 420HP car, I don't think it's that easy to tell.

So, if you really want to add a little touch to your IS-F, and give it even more of a muscle car type feel I would definitely recommend getting this exhaust. Don't know pricing or time line for when it will be available, I will also post that info when I get it.

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daplaya0226

· #5 · May 19, 2008

i thought that all four exhausts worked already? Thats what i read somewhere. Am i wrong?

TAndrews

Discussion Starter · #6 · May 19, 2008

The stacked tips are purely for show, they are not connected to the exahust at all. Just stick your head under the rear of the car to see.

ISFChamp

· #7 · May 19, 2008

The Quad tips let exhaust thru, but are not hooked up directly to the exhaust system. They function there as a way to move the air around the car in a way to keep it "safe" under "higher" speeds.

daplaya0226

· #8 · May 19, 2008

oh! i could have sworn i saw a picture with there actually being exhausts in the tips.

Msedanman

· #9 · May 20, 2008

TAndrews said:
So I finally picked up my car from Borla Performance Industries. Let me just say they did a fantastic job, unfortunately due to cost and warranty issues associated with removing those 'Quad Exahuast Tips' they were unable to do anything cosmetic to the car.

That being said the sound is AWESOME!!!!!! I was worried that it might sound 'ricey', however they really captured the essence of a large 5litre V8. I had a 450mile drive back to Arizona today, so I really got a chance to put the car through it's paces. What you really notice is the sound at the lower rpms. Before the car was really quite until it hit that magic 4000rpm mark, now you have a deep sounding exhaust just when it's idling. What's great to is it's not obnoxious like you hear on some cars, it's enough to get noticed, however it's not over the top.

When I got back to Scottsdale first thing I did was take it to the carwash. I'm not kidding there must have been about 7 different guys come up to me to ask me about my car, and without even saying anything they all commented on how badass it sounds.

Dave and the guys did a great job. I wasn't able to speak with them on friday, so I havn't gotten any dyno reports yet. As soon as I get them, I'll post them. In terms of performance I can't say I can really feel it, however when you increase the HP by 20 on a 420HP car, I don't think it's that easy to tell.

So, if you really want to add a little touch to your IS-F, and give it even more of a muscle car type feel I would definitely recommend getting this exhaust. Don't know pricing or time line for when it will be available, I will also post that info when I get it.

Thanks for the report back.....Sounds like Borla did a great job.
What I'm not clear on is what they did........Can you give some insight into what was done/changed/modified etc etc and the eta on the kit/parts needed for this mod.....

Cheers and enjoy the new sound and few extra ponies....
Colin.

Msedanman

· #10 · May 20, 2008

daplaya0226 said:
oh! i could have sworn i saw a picture with there actually being exhausts in the tips.

I';ve seen that too and it's exhaust from the system tips which are only a short distance back of the dress tips.
C.

TAndrews

Discussion Starter · #11 · May 20, 2008

Borla essentially fabricated a custom exhaust for my IS-F. This will likely go into production sometime in the near future. Last time we spoke we discussed having a cat-less exhaust an a cat-back system.

The version on my is the cat-less, they essentially removed the catalytic converters, obviously by doing that it will increase the performance of the car. However I would not pass a smog check if I needed to get one.

The other version will be all components behind the catalytic converters, still well see some benefit, however not as much, but it is also street legal.

I still don't believe that those tips really serve a function, especially since there is only one exaust pipe pointing towards the top stacked tip. The lower stacked tip has nothing pointing out towards it from the muffler. Lots of cars have things for esthetics only, and I'm cool with that, however I would have really like to get thoses things attached to the exhaust system.

Maybe this still might happen, I'm hoping I will continue to work with them to improve this product, and I see this as an area to improve on.

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Bakasan

· #12 · May 20, 2008

Hey TAndrews, can you post a video so we can check the sound.

Thanks.

Yola

· #13 · May 20, 2008

i think from March he could take a video 100 of times ) may be he doesnt have one! ))

TAndrews

Discussion Starter · #14 · May 20, 2008

I can see about posting a video, however without having really great sound recording equipment and a stock IS-F to compare to in the video I'm not that sure it will do it much justice. I'll check into it and post back.

Msedanman

· #15 · May 21, 2008

TAndrews said:
Borla essentially fabricated a custom exhaust for my IS-F. This will likely go into production sometime in the near future. Last time we spoke we discussed having a cat-less exhaust an a cat-back system.

The version on my is the cat-less, they essentially removed the catalytic converters, obviously by doing that it will increase the performance of the car. However I would not pass a smog check if I needed to get one.

The other version will be all components behind the catalytic converters, still well see some benefit, however not as much, but it is also street legal.

I still don't believe that those tips really serve a function, especially since there is only one exaust pipe pointing towards the top stacked tip. The lower stacked tip has nothing pointing out towards it from the muffler. Lots of cars have things for esthetics only, and I'm cool with that, however I would have really like to get thoses things attached to the exhaust system.

Maybe this still might happen, I'm hoping I will continue to work with them to improve this product, and I see this as an area to improve on.

On my IS-F there are 4 tips directly in front of 4 muffler exits ....
It wouldn't take much work to actually connect those exits to the tips.
Don't know if ours in Canada are different from yours in the US....

TNX for the details, TAndrews.....I await patiently for that Borla system.

Colin

TAndrews

Discussion Starter · #16 · May 21, 2008

Maybe I miss spoke. There are pieces sticking out towards the 'Tips' however they are grossly smaller than the tips and there is a large gap between where they end and the tips begin.

Still not buying that those tips are there for "safety" reasons at higher speeds. It's ok for a car to have non-functioning pieces, no need to justify it, it just is what it is. Still I would have like to get them attached to the actual exhaust. I heard from Dave Borla today, and maybe in the future he might be able to fabricate something, it was just too tight a space and the fabrication would have had to be totally custom. Obviously costs involved are a lot in doing that, especially for a low production car like the IS-F. They would have to significantly increase cost per unit to justify it, which would price the exhaust out of range for a lot of people.

They did an awesome job, what sucks is I love the sound so much that I'm getting about 8mpg because I keep those rpms high all the time...

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jt5585

· #17 · Jun 21, 2008

Did some research as well as several conversations with both dealer and engineering friends. The dealer advised me that the design is not only for show but infact the tips act as a diffuser to help cool the exaust gasses and prevent lift at high speeds. The smart guys verified that it is viable. On a side note being former law enforcement I know ford played around with someting similar on the crown vic's to help keep the car stable at high speeds.

old$parts

· #18 · Jun 21, 2008

Fake tips, no way! Lexus did their homework on this one

jt5585 said:
Did some research as well as several conversations with both dealer and engineering friends. The dealer advised me that the design is not only for show but infact the tips act as a diffuser to help cool the exaust gasses and prevent lift at high speeds. The smart guys verified that it is viable. On a side note being former law enforcement I know ford played around with someting similar on the crown vic's to help keep the car stable at high speeds.

So, according to some of the AutoSpies members, you are almost sold on the IS-F but are too embarrassed to drive it on the street because of the exhaust tips being disconnected from the outlets of the true exhaust pipes. Let's take a look at some of the other cars that you might also be too embarassed to be seen in.

Audi R8:
http://lz7w.com/albums/misc/Picture_011.jpg

Lamborghini Murcielago LP640:
http://images.motortrend.com/photo_...2007_lamborghini_murcielago_lp640+exhaust.jpg

Bugatti Veyron 16.4 @ 4:04:
http://www.youtube.com/watch?v=BhgSV0w1wLg

Thanks to 4TehNguyen @ ClubLexus for the finds.

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ISFChamp

· #19 · Jun 21, 2008

I've been saying that about the tips since day one !!!!

old$parts

· #20 · Jun 21, 2008

ANOTHER QUOTE..The quad pipes are there for a reason. The actual exhaust is recessed from the body and the quad pipes are diffusers. At high speeds (150mph+) the undercarriage windspeeds +exhaust created lift on the rear. Rather than design a larger spoiler and create more resistance, the quad pipe design diffuses the exhaust and eliminates lift. The original design stacked the pipes. The design was then changed to eliminate any rear lift at high speeds. Cool stuff I must say....from rd66

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