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Old 03-31-2004, 08:29 PM   #1
Scooby Specialist
Member#: 56738
Join Date: Mar 2004
Chapter/Region: VIC
Location: Coquitlam
2014 Scion FRS

Default Why is HKS Up/Downpipe no good?

I saw alot of HKS Uppipes and downpipes on Ebay for a relatively cheap price. $140 for an Up, and $280 for both Up and Downpipe.

Then I went ahead and ask if these are good, and they all say it's not as good as Perrin or Helix.
Why is it not good? What are the pro's? Do they leak or something? I thought HKS was a good brand?!

And if I add a Helix uppipe along with my Axleback, how much gain do I get?
And how much are installations usually?
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Old 03-31-2004, 08:44 PM   #2
Scooby Specialist
Member#: 1082
Join Date: Mar 2000
Chapter/Region: VIC
Location: Vancouver, BC
2015 Q50S


HKS downpipes are neither bellmouth nor divorced wastegate type.
Basically it's like a stock downpipe without the cats, the wastegate gases have to make a 90deg turn to join the rest of the exhaust gases.
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Old 03-31-2004, 08:46 PM   #3
Scooby Specialist
Member#: 44137
Join Date: Sep 2003
Chapter/Region: VIC
Location: Vancouver, BC

people who hate HKS becuase it's a Japanese brand I guess some people reported uppipe leak with it, same as Subydude's or some others..

downpipe-- they favor the bell mount DP design, so they may again claim that HKS design is no good... cause HKS uses the stock DP design which blocked the wastegate exit.

I personally think, if u're not going to get 300 whp, don't worry about HKS, it's good for the money.... just make sure 200% that the shop swapped a brand spanking new UP gasket for you and tighten them.
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Old 03-31-2004, 08:56 PM   #4
Scooby Specialist
Member#: 38225
Join Date: Jun 2003
Chapter/Region: VIC
749 04STI 06CLS55
RangeRoverSport s/c


HKS DP is more restrictive than the other brands. less airflow less gains
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Old 03-31-2004, 10:58 PM   #5
Benjamin Tang
Scooby Guru
Member#: 4496
Join Date: Feb 2001
Location: British Columbia Canada
2009 Forester


i say save up for something better. full bellmouth or divorced wastegate design is best for downpipe. but i don't know enough about uppipes though because mine was a 1-piece design with my exhaust manifold
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