HKS HiPower - Subaru WRX Forum
 
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post #1 of 14 Old 08-09-2006, 08:26 AM Thread Starter
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HKS HiPower

everytime i read an exhaust thread on this site all i ever hear is how loud the HKS exhaust is....... well i just put it on this week and im not that happy with it.... i think its too quiet.....
am i just cazy or is there something wrong here?
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post #2 of 14 Old 08-09-2006, 08:33 AM
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What othr mods do you have on your car?
If you just did the Cat back you will not notice a huge difference.
Change your dp and then you will hear a monster of a difference.
I have heard that exhaust on an 06 with a dp and it is fantastic. Loud but fantastic.

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post #3 of 14 Old 08-09-2006, 08:54 AM
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When people talk about changing the exhaust such as getting a turboback or simplying changing the downpipe to get performance are you talking about getting such pipeing without cats? Is that the only way to get a louder exhaust and more performance by removing cats? I'd like to get a new exhaust to get better sound but I don't feel like dealing with having the car illegal either.
I guess my question is I have an 06 so I only have two cats as is but if I want to get a down pipe and a catback do I have to go catless to get sound and power. Is that the point of changing the downpipe or does the factory one just restrict power.

Dan
2006 WRX
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post #4 of 14 Old 08-09-2006, 09:56 AM
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Yes, when people talk about upgrading exhausts for power, they're usually refering to a cat-less one. Since some aftermarket exhaust are available with both catted and non-catted versions, your answer is no. You don't have to go fully cat-less to get better power and sound.

The factory exhaust's is flawed in alot of ways. This is for emissions and sound (noise) mostly, so yes the exhaust is very restrictive for the most part. Not necessarily the cat-back portion, but the downpipe is just terrible from a performance standpoint. The bends suck, there are too many cats in it, and the mouth of the downpipe is well, stupid.

That pretty much sums it up for me.

My car is well, it's like 10 lbs of shit in a 5 lb bag...

<------ Click to see what I'm workin' with. ;)
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post #5 of 14 Old 08-09-2006, 11:08 AM
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Quote:
Originally Posted by 9d2TSi
Yes, when people talk about upgrading exhausts for power, they're usually refering to a cat-less one. Since some aftermarket exhaust are available with both catted and non-catted versions, your answer is no. You don't have to go fully cat-less to get better power and sound.

The factory exhaust's is flawed in alot of ways. This is for emissions and sound (noise) mostly, so yes the exhaust is very restrictive for the most part. Not necessarily the cat-back portion, but the downpipe is just terrible from a performance standpoint. The bends suck, there are too many cats in it, and the mouth of the downpipe is well, stupid.

That pretty much sums it up for me.
So is it still worth changing the factory downpipe with a new downpipe with a cat. Or is it pretty much pointless unless you go catless. What is the power difference between getting a cat dowbpipe vs. catless downpipe?

Dan
2006 WRX
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post #6 of 14 Old 08-09-2006, 12:23 PM
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Yes, it will be worth it.

My car is well, it's like 10 lbs of shit in a 5 lb bag...

<------ Click to see what I'm workin' with. ;)
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post #7 of 14 Old 08-09-2006, 01:02 PM
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Cobb reports only a 1-2hp difference between their catted and catless pipes, and most other DP's I've read about report little or no loss by adding a cat.

-Justin, aka Gomer
(sold)-05 WRX
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post #8 of 14 Old 08-09-2006, 01:34 PM
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The loss is minimal for peace of mind. Make sure yu get a bellmouth design downpipe.

Big Jae -
JDM version 7 bugeye
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post #9 of 14 Old 08-09-2006, 01:38 PM
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thanks for the input

Dan
2006 WRX
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post #10 of 14 Old 08-09-2006, 02:46 PM
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Bellmouth or a divorced wastegate design, most are bellmouth's though.

-Justin, aka Gomer
(sold)-05 WRX
(new)-04 Cadillac CTS-V
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post #11 of 14 Old 08-25-2006, 06:47 PM
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I have the HKS with bellmouth and no cats, i think mine is loud and it sounds really good. I am very happy with it.
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post #12 of 14 Old 08-25-2006, 07:33 PM
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i didnt know hks had a bellmouth design. unless i mis understood you.
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post #13 of 14 Old 08-26-2006, 01:20 AM
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No they dont sorry if i was unclear. I have the HKS cat-back with a Tsudo catless DP with the bellmouth. Sounds very nice
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post #14 of 14 Old 09-01-2006, 10:28 PM
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hks high power

ya i did the cat back at 1st and it wasnt too loud, but after the down pipe omg it was sweet. but then i need to get it tuned with the cobb ap cause it will throw the check engine light on cause the o2 sensor. but its worth it
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