Looking at getting a downpipe...

'05CrystalGray · 02-16-2006, 08:40 PM

I have been looking into down pipes (already searched but couldnt find an answer to my specific questions). The two i have been looking at are the HKS and the Bosal. I have a few questions about each.

HKS:
How do you like the flat flange design?
How is the fitment and quality?

Bosal:
How do you like the twin dump/divorced waste gate design?
How is the fitment and quality?

How do you guys like them, any positive or negative comments about either?

Thanks for the help,
Joe

LightWerkz · 02-16-2006, 08:43 PM

HKS is no good. trust me.

Bosal...heard of it before, just never seena review..

'05CrystalGray · 02-16-2006, 08:53 PM

Quote:

Originally Posted by ESsTeAEyEe

HKS is no good. trust me.

Bosal...heard of it before, just never seena review..

What about the HKS makes it no good, quality, fitment?

VetteVert · 02-17-2006, 04:12 AM

If they are still the same as they used to be, they are simply the stock DP minus cats. It still has the flat plate design which is not good for max performance.

VV

Thor RagingThunder · 02-17-2006, 10:56 AM

I've been doing the same homework, as I've always ran H&S bits in the past. After much research, the Cobb w/ a cat is my first choice.

Rootus · 02-17-2006, 11:11 AM

Have you considered the MadDad pipe?

2jzgte · 02-17-2006, 12:55 PM

The stock DP is a flat plate design just like the HKS. How can anybody say it's no good. Subaru found it to work well enough to put on a factory car!

IMHO there may be better DP's out there but its all speculation until somebody supplies some logs or dyno plots to prove otherwise.

RSVCHAD · 02-17-2006, 01:33 PM

Quote:

Originally Posted by 2jzgte

The stock DP is a flat plate design just like the HKS. How can anybody say it's no good. Subaru found it to work well enough to put on a factory car!

Correct, the Subaru engineers decided to use this design on a stock car acheiving stock power levels. They also had heavy concerns regading noise, emissions and reliabilty, which typically are overriding factors of power in an OEM application. Bellmouth and Divorced WG designs will offer better performance. I personally vote for the Cobb catted DP. You get what you pay for.

USAF_STi · 02-17-2006, 08:29 PM

I also vote no on the HKS down pipe. get a bellmouth style downpipe.Helix makes a great downpipe for the money.

telum01 · 02-17-2006, 08:37 PM

i've heard nothing but bad things about the hks downpipe. first off, the flat-flange design blocks the flow of the wastegate (fine for the stock car, but extremely bad if you're not staying stock), plus the fitment isn't that great. if you're going aftermarket on the dp you could get one from txs, cobb, helix, invidia... there's a bagillion of them out there.

02-16-2006, 08:40 PM	#1
'05CrystalGray Senior STI Driver Car: 05 STI, 03 Cobra Location: Colorado Posts: 340 IWSTI Addict since: Apr 2005 Trader Rating: (2)	Looking at getting a downpipe... I have been looking into down pipes (already searched but couldnt find an answer to my specific questions). The two i have been looking at are the HKS and the Bosal. I have a few questions about each. HKS: How do you like the flat flange design? How is the fitment and quality? Bosal: How do you like the twin dump/divorced waste gate design? How is the fitment and quality? How do you guys like them, any positive or negative comments about either? Thanks for the help, Joe This ad is not endorsed by this member. Please register or login to hide this ad.

02-17-2006, 08:37 PM	#10
telum01 Junior STI Driver Car: 05 STi, 04 330i Fav Mod: Me in the driver's seat :P Location: Grovetown, GA Posts: 137 IWSTI Addict since: Nov 2005 Trader Rating: (1)	i've heard nothing but bad things about the hks downpipe. first off, the flat-flange design blocks the flow of the wastegate (fine for the stock car, but extremely bad if you're not staying stock), plus the fitment isn't that great. if you're going aftermarket on the dp you could get one from txs, cobb, helix, invidia... there's a bagillion of them out there. This ad is not endorsed by this member. Please register or login to hide this ad.

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02-16-2006, 08:43 PM	#2
LightWerkz STI Master Car: E46 M3 Fav Mod: ZCP Wheels Location: Clifton Posts: 7,473 IWSTI Addict since: Aug 2005 Trader Rating: (78)	HKS is no good. trust me. Bosal...heard of it before, just never seena review..

02-17-2006, 04:12 AM	#4
VetteVert Junior STI Driver Car: 05 Subaru WRX STi Fav Mod: Rally Armor! Location: Boone, NC Posts: 166 IWSTI Addict since: May 2003 Trader Rating: (0)	If they are still the same as they used to be, they are simply the stock DP minus cats. It still has the flat plate design which is not good for max performance. VV

02-17-2006, 10:56 AM	#5
Thor RagingThunder Professional STI Driver Car: 06 CGM STI Fav Mod: Phil Wicks Driving Academy Location: Watching over the Gods Posts: 477 IWSTI Addict since: Feb 2004 Trader Rating: (6)	I've been doing the same homework, as I've always ran H&S bits in the past. After much research, the Cobb w/ a cat is my first choice.

02-17-2006, 11:11 AM	#6
Rootus S204 Racer Car: 2006 STI Fav Mod: Recaros Location: Mahan, OR Posts: 2,900 IWSTI Addict since: Sep 2005 Trader Rating: (1)	Have you considered the MadDad pipe?

02-17-2006, 12:55 PM	#7
2jzgte Junior STI Driver Car: 07 UGM Ltd Fav Mod: APv2 Location: NC Posts: 75 IWSTI Addict since: Feb 2006 Trader Rating: (0)	The stock DP is a flat plate design just like the HKS. How can anybody say it's no good. Subaru found it to work well enough to put on a factory car! IMHO there may be better DP's out there but its all speculation until somebody supplies some logs or dyno plots to prove otherwise.

02-17-2006, 08:29 PM	#9
USAF_STi Spec C Club Car: 05' CGM on silver Fav Mod: Ed's tune! Location: Bay Area NorCal Posts: 1,926 IWSTI Addict since: Sep 2004 Trader Rating: (2)	I also vote no on the HKS down pipe. get a bellmouth style downpipe.Helix makes a great downpipe for the money.