HKS Exhaust Choices - Which one do I go with?

[Ashikabi]

Originally Posted by SuperTom

Thank you for this post I'm glad you didn't call me silly Wouldn't say I'm going for maximum lightness or I would just rip everthing out. Car is driven 100 miles a day to work so it has to be reasonable plus its brand new. Just want to add lighter parts when I have the opportunity.
Have done other things just didn't list them all I will address your comments
-I really like the comfort and support of these seats so will stay for now.
-Went with Racer X on my LCA's which didn't save weight but needed the ease of adjustment while on the car. - couldn't get a direct answer if the Velox did or not, Saw people cutting the frame for more room?
-Took all the spare stuff out but forgot I added in 5lbs for a small pump and a can of fix-a-flat.
-Got a Perrin pipe so got rid of sound tube and a resonator -2lbs!!!!
-Exhaust is what I'm working on now want light but bearable So no straight pipes
-Keeping the sound deading so far, Ive scraped the tar off my old 3000gt before and got 15lbs worth in a bucket!!
- Agree with keeping all the bottom undertrays as screwing with the stock aero would just cause drag - learning about how the cannon style mufflers could hurt the rear aero on this car.
-Exactly not doing anything to add weight, no coolers, extra bracing unless I find I really need it, No Heavy BBK with heavier 18" wheels. No heavy FI kits.(At least for now)


Here is a quick file ive been keeping track of weight reduction with.

Pretty sure the Essex Sprint bbk is significantly lighter than stock

[Mackizzle86]

Originally Posted by SuperTom

Don't want to hear that weight reduction is very important for a vehicle like this with low power. Every little pound adds up in the end. Already about 87lbs lost from Wheels/tires 24, Pulleys 5, Front bar 15, Windshield washer removal 6, Spare/tool removal 31,UEL Headers+Overpipe 6lbs .


Not a professional but do a few HPDE events.


Back on topic just wanted to point out the difference between the 2 Spec L exhausts is more than just the tips.

Spec L Titanium tip is out of stock, and HKS USA is even clueless when they're going to be available stateside.

[SuperTom]

Originally Posted by Ashikabi

Pretty sure the Essex Sprint bbk is significantly lighter than stock

yeah that's true. If I go with a brake change its going to be the old WRX Wilwood kit that knocks a whopping 32lbs off the front of the car. I know that its only slightly better than stock performance but should have no problem stopping a car significantly lighter

[SuperTom]

Originally Posted by Mackizzle86

Spec L Titanium tip is out of stock, and HKS USA is even clueless when they're going to be available stateside.

I see that most sites are out of stock. Hoping the HKS guy chimes in and can verify the weight of the carbon tip one as the HKS site lists it at 22lbs (10kg) https://www.hks-power.co.jp/en/produ...ffler/db/15580
Also still not sure if I want a cannon style need more research into the aerodynamic part. I can see removing the muffler from the stock area would leave a big area to act as a parachute. For now going to just order the HKS dual resonated front pipe.

[churchx]

SuperTom: just install some diffuser to not just "fix" parachuting effect but decrease drag/increase downforce in general.

[Ashikabi]

Originally Posted by SuperTom

I see that most sites are out of stock. Hoping the HKS guy chimes in and can verify the weight of the carbon tip one as the HKS site lists it at 22lbs (10kg) https://www.hks-power.co.jp/en/produ...ffler/db/15580
Also still not sure if I want a cannon style need more research into the aerodynamic part. I can see removing the muffler from the stock area would leave a big area to act as a parachute. For now going to just order the HKS dual resonated front pipe.

I had the Greddy cannon style mufflers with my uel and it droned at highway speed. Otherwise it sounded great. Cold start was LOUD. Use a diffuser to fix parachute. Or make a cover plate

[SuperTom]

Originally Posted by churchx

SuperTom: just install some diffuser to not just "fix" parachuting effect but decrease drag/increase downforce in general.

Originally Posted by Ashikabi

I had the Greddy cannon style mufflers with my uel and it droned at highway speed. Otherwise it sounded great. Cold start was LOUD. Use a diffuser to fix parachute. Or make a cover plate

Have considered that option but adding in a diffuser would add 7lbs back in negating the purpose of lighter exhaust plus add in $$$$. Though A simple aluminum lightweight coverplate may do the trick


Most likely going to go with a stock style exhaust. HKS Legamax Premium has my eye for this but cant believe its 51LBS! That's 13lbs heavier than stock with basically the same design! There website has not weight info for it https://www.hks-power.co.jp/en/produ...ffler/db/13671 . I'm trying to read through threads to see if anyone else who has this weighted this one. Having a hard time believing HKS would make the thing out of lead.


Also open to any other 60mm piping exhausts (stock style) which seem to be mostly Japanese makes for that size standard.

[Ashikabi]

Originally Posted by SuperTom

Have considered that option but adding in a diffuser would add 7lbs back in negating the purpose of lighter exhaust plus add in $$$$. Though A simple aluminum lightweight coverplate may do the trick


Most likely going to go with a stock style exhaust. HKS Legamax Premium has my eye for this but cant believe its 51LBS! That's 13lbs heavier than stock with basically the same design! There website has not weight info for it https://www.hks-power.co.jp/en/produ...ffler/db/13671 . I'm trying to read through threads to see if anyone else who has this weighted this one. Having a hard time believing HKS would make the thing out of lead.


Also open to any other 60mm piping exhausts (stock style) which seem to be mostly Japanese makes for that size standard.

I have the legamax premium but I never weighed it

[Hawk77FT]

I cannot believe this thread became so long! Go with the exhaust that fits! There is your answer. Oh and look for something that you like the sound of, however any change (header, front pipe, etc) will affect the sound significantly!
As for weight...ffs there is a difference of 2kg between one or the other. Power to weight ratio? the car weighs about 1290kg/200 hp = 6.45/kg. take two kg and you get 0.4 of hp /kg. Nothing you will feel. Unless, you really go all out (strip the interior, carbon fiber panels, etc) the 2 kg will do FA nothing in the whole scheme of things. We are talking here about a cheap as car, with low power with good handling not LFA level car! Performance wise, the catback adds no power...maybe 2 hp if that! In the whole scheme of things and the real life fluctuations in temperature, etc, will mean nothing.
Once again, get something you like the sound of!

[SuperTom]

Originally Posted by Hawk77FT

I cannot believe this thread became so long! Go with the exhaust that fits! There is your answer. Oh and look for something that you like the sound of, however any change (header, front pipe, etc) will affect the sound significantly!
As for weight...ffs there is a difference of 2kg between one or the other. Power to weight ratio? the car weighs about 1290kg/200 hp = 6.45/kg. take two kg and you get 0.4 of hp /kg. Nothing you will feel. Unless, you really go all out (strip the interior, carbon fiber panels, etc) the 2 kg will do FA nothing in the whole scheme of things. We are talking here about a cheap as car, with low power with good handling not LFA level car! Performance wise, the catback adds no power...maybe 2 hp if that! In the whole scheme of things and the real life fluctuations in temperature, etc, will mean nothing.
Once again, get something you like the sound of!

Well I went with the Legamax premium the whole midpipe & Rear for ~$700 shipped. I think they were charging $1300 when they first came out. And the dual resonated front pipe for ~$300 shipped.


I will post up pictures when I get home for work. Not much weight loss maybe 1lbs less for the whole Legamax. Midpipe is ~13lbs, axleback is ~24lbs big muffler and nice 5" tips. Disappointing in that sense but the sound clips I heard with that setup + UEL catless headers sounds deep and clean. Had to put my weight loss psychosis aside for a sane daily driver.


The good thing is that it looks like a stock pipe routing with the ability to take off the axleback. If its too quiet can always change it too a straight pipe or just drop it for track days.

[Clipdat]

Kinda lame that Torry at HKS USA has completely abandoned this thread and the forums.

Last Activity: 02-17-2017 09:36 AM

[SuperTom]

Originally Posted by Clipdat

Kinda lame that Torry at HKS USA has completely abandoned this thread and the forums.

Last Activity: 02-17-2017 09:36 AM

Agree its lame we as consumers have to do all the research work on parts.


I will be installing this weekend but here are some preliminary pics.


BIG box



Packaging was great as to not get hurt in transport.





Hard to see from the pic but the outsite diameter is 60mm claimed. Measured inside diameter is 56mm consistent all the front pipe and rear exhaust. Was hoping it would be exact match to the end of my overpipe which is 58mm inside diameter. Again at least its consistent all the way through to keep velocity high.





Here are the weights (my cat likes to be in every damn picture) :
Dual resonated Front Pipe - 8.25lbs



Midpipe - 13.25 lbs



axleback - 24.75



So the front should be about 2lbs lighter than stock and the total catback about the same as stock


Nicely polished really like the big tips on this




CON: I'm going to say this but the welds do not look clean especially compared to my no name(gruppe-s/ gent5) Uel headers. They are thick and lumpy but hopefully should hold up well. You can see where they burn through to the inner pipe on a few and will need to be grinded smooth





Explains why the price is nearly cut in half, A nice system if you don't look at the welds. But overall I'm very excited to hear this car roar with this setup. Stay tuned

[Clipdat]

Typical HKS welds. All their stuff pretty much looks like that as far as I recall.

[weederr33]

Very nice. Wish I could get a hold of their catted/ resonated front pipe without having to buy the header as well. :/