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08-08-2002, 03:02 AM | #1 |
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My concern about the new HKS Downpipe
Ok, it's obvious HKS and omitted the factory donut
gasket that allows twisting and flexing. It seems to me people are just BLINDLY installing this to their stock exhaust, which needs a flex... something is going to break. The only exhaust I can see this working correctly with is the HKS Carbon hiper exhaust which has a built-in flex joint. Does anyone know if the Stainless HKS Hiper exhaust has the same flex joint? I guess I'll be returning this and getting a PDE downpipe Matt
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08-08-2002, 03:05 AM | #2 |
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downpipe
hi to you i am using the hks downpipe and i dont have aproblem wite that but if you consider to switch the turbo to the sr40
try to find twin dump pipe to install bye |
08-08-2002, 03:42 PM | #3 | |
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Re: downpipe
Quote:
no flex! Matt |
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08-08-2002, 04:01 PM | #4 |
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they all should have a flex joint on the mid-pipe. most aftermarket exhaust dont use that donut joint.
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08-08-2002, 04:07 PM | #5 | |
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Quote:
has a provision for the stock donut. Turboxs has a donut also, although it is their own design and bigger than stock. Am I missing something here, or are people not understanding me? Matt |
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08-08-2002, 04:21 PM | #6 |
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Had a BPM for a year.... no flex there bud... was fine..
Flex is a lot less prevelent on any motor that is not transverse mounted... your have torsional strain... meaning the whole exhaust may wanna angle down a bit and twist on it's hangers... compared to a transverse mounted motor that's going to try and put the whole exhaust through the floor board, muffler first. Lot's of things in life don't use flex joints... and they're fine... I have a 1000CC bike that makes enough torque to power wheelie my petiteness at 100MPH... and the Yoshimura exhaust I've had since 98 hasn't bawked once. Think about it... Jorge (RiftsWRX) www.ProjectWRX.com |
08-08-2002, 04:49 PM | #7 | |
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Quote:
can't compare a bike exhaust that is 3 - 4 feet long to a car's exhaust that is over twice as long. The WRX's engine twists a great deal in it's mounts, and the first thing that is going to give are the gaskets, then the welds. I'd like to see how long your exhaust lasts before you get leaks or cracks. I studied structural engineering in college, it's dumb to build an exhaust without a flex. Matt |
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08-08-2002, 05:50 PM | #8 | |
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Quote:
Exhaust systems have been built without flex joints for like 90 years or so. It's not going to hurt anything by not having one. Besides, the tubing is bolted to a soft rubber joint, and the rubber will take most, if not all, of the movement. |
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08-08-2002, 07:24 PM | #9 | |
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Quote:
So why did you even guy the HKS downpipe to begin with???? There were plenty of pictures availible of the downpipe that clearly showed that there was no flex joint. For $175 what do you expect???? |
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08-08-2002, 08:02 PM | #10 | |
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Quote:
they were not very good. The shop said it would have a bell shaped opening, and would work with the stock midpipe. This is what I get for being impatient and trying to go cheap Mat |
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08-08-2002, 09:24 PM | #11 |
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I happy as I can be for $175.00 shipped.
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08-08-2002, 10:23 PM | #12 |
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I have the Stainless Steel HKS HiPower CatBack and it does have the flex joint. Comes gaskets too ofcourse. Pretty nice exhaust, really quiet. Cant really hear it over 4k rpm cuz the engine is louder now after the exhaust.
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08-08-2002, 10:51 PM | #13 |
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HKS Down pipewith HKS CATback HI-Power
I just installed yesterday with the help of a good friend of mine my HKS Stainless HiPower Cat back, HKS Down Pipe and PDE Uppipe..... The car is a litle too loud for my taste but it feels AWSOME!!!!! Check engine light came on today.....What should I do about that???any tips????
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08-08-2002, 10:59 PM | #14 | |
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Quote:
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08-08-2002, 11:07 PM | #15 | |
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Quote:
with the flex... Matt |
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08-08-2002, 11:08 PM | #16 |
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mil eliminator
ChrisV-FL
Buy a MIL (CEL) eliminator from www.ponyexpresspeformance.com its $20 You splice this resistor at the O2 sensor at the last cat and you dont get a CEl from having no cats... evan |
08-08-2002, 11:22 PM | #17 |
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I got one cause they are so cheap, basically throw away exhaust if they get too bad.
no big deal imo, its better than stock |
08-12-2002, 01:50 PM | #18 |
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For all ya'll in california
Hi, right now i'm currently in hawaii, but my car will be in cali soon... i'm running no cat.. how would i go about passing the smog and whats the minimum require cat in cali? someone give me a hand.. thanks
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08-12-2002, 02:34 PM | #19 |
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Flexing.
We had a discussion about this not too long ago for just the uppipe. I did not think you needed flex since the turbo moves with the engine. However, one member brought up a good point, that the pipes expand and contract a lot. This would be a good reason for flex on the upipe. More for expansion instead of for movement. On the dp, I think it would be foolish to think flex would not be helpful in this application. The hangers have some flex, but I think an in line flex joint would add to the reliability of the system.
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08-12-2002, 08:47 PM | #20 |
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A Flex is a nice thing to have in an exhaust..not a huge one, but some is good. relying on the hangers alone is foolish for long term, but fine for short term.
This is not a substandard HKS piece though guys....it is NOT designed for a street car, hence the no cats. Same goes for all HKS downpipes actually....all are really off road only. As for the up-pipe flex, it is not needed at all IMHO...it will surely be the first thing to go wrong in the future. yes the pipes expand anc contract, but if the up-pipe is built properly to begin with fitment wise, it will be fine. |
08-17-2002, 11:05 PM | #21 |
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so basically it would be best to make this downpipe to an hks catback (hipower or carbon ti both have flex joints)
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08-18-2002, 03:04 AM | #22 | |
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Quote:
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08-18-2002, 09:37 PM | #23 |
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no hes saying that its high quality, but its illegal to run them on a car that is liscensed for street use
just like most every other exhaust that people talk about in this forum. TXS stage2 illegal, vishnu stage 0 illegal, cobb clubspec illegal, hks downpipe illegal... about the only thing thats legal to do is change out the catback. |
08-18-2002, 11:07 PM | #24 |
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I think that this is a moot point, anything can be legal if you pass. But back to the origional point, our engine flexs a lot less than many other turbo engines that have never had flex joints! So why should this one? Do you think the race car does? Do you think that a solid piece of high quality pipe would leak sooner than one with a point that is made of braided steel, and not truely sealed? If you think that for some reason turbo dp's "require" flex joints, on even such a low torque engine, maybe you should consult a higher power! Reeves Calloway, does not seem to think that it was necassary for the Sledgehammer. Porsche, doesn't seem to find it necassary for the GT-2! And NOBODY seems to think of it for the insane Supra, 360 Modena, F-40, F-50. But for those of you who are just paranoid, I think that they do have it on Semi trucks..... Which realy shouldn't help you at all.
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