Jump to content
SAU Community

Recommended Posts

My friend had one on his car and I wouldn't have called it silent that's for sure. You could hear him coming from a mile away.

On the road both his and my R33's performed very similar with nearly identical mods. The difference was I had a HKS Super Dragger. Mine was much quieter especially low and the performance up top appeared to be basically same.

So, the HKS Hi-power Silent was a good exhaust and sounded pretty good too. In the end it just created too much attention and wasn't as nice to live with every day so he sold it. He felt like every second person was going to call the EPA.

I run HKS Silent Hi-Power exhaust on my R34. LOVE IT.

It's quiet enough for a very free flowing exhaust. I think I sit on the dB limit at idle. Obviously it's a little louder when you're on throttle but I am running some mods that don't help that situation.

Cheers.

I am running one on my R33 full 3inch system and high flow cat with about 340hp atw.

As said already they are not silent by any means. They give off a very nice RB tone.

I don't think there would be any power loss unless you go a size that's too big for your set-up.

So any upgraded exhaust system will usually be much better performance than a stock set-up exhaust.

So basically if your after a nice tone and have the money to spend on one then they are a nice exhaust, But if your already running aftermarket exhaust and you are happy with the tone you already have then i wouldn't bother spending for a small gain if any. You could spend money on a better flowing high flow cat which would probably give you a better gain.

Hope my 2 cents helps you out.

Cheers

Nothing wrong with the HKS Hi Power Silent...as said...they still flow well...just that they have spent time to engineer a proper exhaust that keeps the noise down...

I went from a loud as custom exhaust with a cannon muffler to a quiet trust system and picked up a few kw actually...quiet doesn't necessarily mean restrictive...

As everyone has mentioned above. Hard to question HKS's workmanship. You will without a doubt notice incredible gains coming on boost when added to a hi flow cat and front/dump pipe.

Don't get the HKS Silent Hi Power confused with a aftermarket exhaust that has a removable silencer. Those are what cause restrictions. If you pick up a HKS silent you won't find a silencer shoved in there.

m2c

I run HKS Silent Hi-Power exhaust on my R34. LOVE IT.

It's quiet enough for a very free flowing exhaust. I think I sit on the dB limit at idle. Obviously it's a little louder when you're on throttle but I am running some mods that don't help that situation.

Cheers.

Jeeeesus. If you sit on the Db limit at idle, thats pretty loud. The Db limit is supposed to be at 75% of peak power rpm; so 5500 rpm or something like that.

Shaun.

I got one on my 32 gtr.

I personally think its too quiet for me... it does have a nice idle tone to it.

I dont think cops will ever pull me over for the noise tho.

My hks hipower silent catback also has the hks front pipe with stock dumps..

I only noticed a big difference when i changed my catalytic converter (since my old random jap catback had rusted) to a 3.5inch hi flow one....

Gotta hate compliance cats :(.

I have an HKS silent series exhaust and I like it. I don't know what my "gains" are, but it is a very nice system for my car as it is a DD and I don't want to be obnoxious. My car came with it from Japan, but I also got a down pipe and a test pipe when I got it here and that made a difference in sound (little louder and deeper) and turbo also spools a bit quicker.

The only reason they named it silent is because they have added a small hotdog resonator in the pipe as opposed to the standard hks system which has none. So really it's not in reference to it being so quiet no one can hear you it's just they have added this little piss ant thing in to make it a little more street friendly than a straight through pipe. In terms of power gains, unless you will be running a big hp car I doubt you'll run into exhaust restriction problems.

Hi there,

Yep bought a hks hi power silent for my gtst running the 2835 pro s turbo kit. Way too loud - drove it round the block and took it off - sold and bought a trust PE 2 (Power Extreme 2) - it's much quieter and the car makes about 260 - 270rwkw.

The hi power silent sounded like a race exhaust in comparison and you'll get too much attention from traffic police - don't forget though that stock turbos bring the noise down in comparison to larger ones.

Hi there,

Yep bought a hks hi power silent for my gtst running the 2835 pro s turbo kit. Way too loud - drove it round the block and took it off - sold and bought a trust PE 2 (Power Extreme 2) - it's much quieter and the car makes about 260 - 270rwkw.

The hi power silent sounded like a race exhaust in comparison and you'll get too much attention from traffic police - don't forget though that stock turbos bring the noise down in comparison to larger ones.

^^^^Yeah, thats important to remember.

There is no point in comparing a car with a single highmount to a car with smaller twins (or single), as the turbine housing size makes a massive difference to sound. I remember when i changed from a 0.82 ar to a 1.06 ar and, with everything left the same, the exhaust note from the 1.06 was significantly louder.

Shaun

Jeeeesus. If you sit on the Db limit at idle, thats pretty loud. The Db limit is supposed to be at 75% of peak power rpm; so 5500 rpm or something like that.

Shaun.

True but with my setup, there's not much I can do to bring the noise down under load. I just have to deal with it. Unless I start shoving in silencers and no one wants that! To be honest, I don't think it's quite at 92dB at idle but it would be close.

Cheers.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Per Mark Roberts of Sonictune: Mark Robert Author At this time, no. No ETA either 2016-17 models. You will be able to purchase and install a 2018.5+ TCU though   TCU purchasing and pricing info! As we near the release of TCU tuning, I am going to answer some questions I get asked often.   What do I need for TCU tuning? At this time, you will need a 2018.5+ TCU to be able to tune. If you have a 2016-to early 2018, you will need to replace your TCU with the newer version. One good way to know if your TCU is good is if you have auto upshift in manual mode in 1st gear around 6500 rpms. If your manual 1st gear goes to 7k rpm and will hit the rev limiter unless you shift, you have the older TCU.   Why do I need to buy another ecu license/phone flash if I already have it on my ECU tune? The TCU is its own computer module. It is completely separate from the ECU. Because of this, you will be required to purchase a TCU license and, if your tuner has it, the phone flash license required to tune it via phone/bluetooth.   Do I need TCU tuning? TCU tuning is NOT required. However, the faster your setup, the more it will assist in track and dragy time consistency.   If I’m ECU tuned by (tuner A) can I get my TCU tuned by (Tuner ? Yes, since it’s a different module and a completely separate flash, you can have two different tuners. However, it is highly recommend that you have both tuned by the same tuner. For me, my TCU tuning will directly complement my ECU tuning style and features and running my ECU and another TCU or vice versa MIGHT cause some issues. At this time and for the foreseeable future, I will only be tuning my current ECU tuned customers TCUs.     I have a SYVECS AWD controller. Do I still need it? Yes! The AWD controllers main job is to control your AWD system. However, with TCU tuning, you will no longer need the auto-shift function as that will be done through the TCU. The AWD controller will still be very beneficial for racers looking to maximize traction on the launch.     Shift schedule changes: holding gears longer at lower pedal input as well as max shift rpm changes. Please note, the new ECU race rom coming out will address 90% of the shitty drivability issues these cars have through custom maps from myself and Racebox—as well as others I am sure.   Increase shift speeds: as seen in the videos I’ve been posting, the TCU shifts much faster once tuned.   Increased shift pressures: as also seen in the videos, much firmer full throttle shifts.      
    • Per Mark Roberts of Sonictune:     Mark Robert Author At this time, no. No ETA either 2016-17 models. You will be able to purchase and install a 2018.5+ TCU though   TCU purchasing and pricing info! As we near the release of TCU tuning, I am going to answer some questions I get asked often.   What do I need for TCU tuning? At this time, you will need a 2018.5+ TCU to be able to tune. If you have a 2016-to early 2018, you will need to replace your TCU with the newer version. One good way to know if your TCU is good is if you have auto upshift in manual mode in 1st gear around 6500 rpms. If your manual 1st gear goes to 7k rpm and will hit the rev limiter unless you shift, you have the older TCU.   Why do I need to buy another ecu license/phone flash if I already have it on my ECU tune? The TCU is its own computer module. It is completely separate from the ECU. Because of this, you will be required to purchase a TCU license and, if your tuner has it, the phone flash license required to tune it via phone/bluetooth.   Do I need TCU tuning? TCU tuning is NOT required. However, the faster your setup, the more it will assist in track and dragy time consistency.   If I’m ECU tuned by (tuner A) can I get my TCU tuned by (Tuner ? Yes, since it’s a different module and a completely separate flash, you can have two different tuners. However, it is highly recommend that you have both tuned by the same tuner. For me, my TCU tuning will directly complement my ECU tuning style and features and running my ECU and another TCU or vice versa MIGHT cause some issues. At this time and for the foreseeable future, I will only be tuning my current ECU tuned customers TCUs.     I have a SYVECS AWD controller. Do I still need it? Yes! The AWD controllers main job is to control your AWD system. However, with TCU tuning, you will no longer need the auto-shift function as that will be done through the TCU. The AWD controller will still be very beneficial for racers looking to maximize traction on the launch.     Shift schedule changes: holding gears longer at lower pedal input as well as max shift rpm changes. Please note, the new ECU race rom coming out will address 90% of the shitty drivability issues these cars have through custom maps from myself and Racebox—as well as others I am sure.   Increase shift speeds: as seen in the videos I’ve been posting, the TCU shifts much faster once tuned.   Increased shift pressures: as also seen in the videos, much firmer full throttle shifts.      
    • The fancy pants red shock tower brace is finally incoming from MX5 Mania, getting it shipped from 'Merica has been a long and problematic process, and GWR, the 'Merican supplier will not ship directly to consumers outside of the US, Mania basically had to order a heap of them, the colour choice was silver, or red, and we all know anything red adds 5 killerwasps of dynotorques..... Whilst it does fit over a 2.5, and I've seen a few photos and videos of it being installed and fitting, google also says it might get real close to the FAB9 intake front runner, people in the US says it does fit with the FAB9 intake, except for one person who said it slightly touched.......so there is that.....LOL..... As it seems that I am the first in AU to have this combination of parts there's no local knowledge about fitment, so I'm just a willing guinea pig in this endeavour, I'll cross my fingers and toes and hope for the best In other news, I ordered stuff from China  on the same day I ordered the 23° silicone bend from Victoria, the stuff from China arrived a day ago, the 23° silicone bend is still travelling around Australia thanks to Australia Post, and "may" be here next week
    • Very good news...I contacted Racebox about it last night. My car is a 2016 so remains to be seen if it is compatible, requires a TCU swap, or is impossible.
    • What ECU are you running? This is probably the biggest question. If it's a PowerFC, I'd probably change the ECU and get something newer that will handle the injectors in a nicer way.
×
×
  • Create New...