Most places selling the pipe claim it IS stainless steel. I guess I'll find out after this winter. HKS USA's website even says it's stainless steel.ebr0t said:500 downpipe???? WTF
hks is cheap because its not stainless steal and its not bellmouthed.
You're right, you do get what you pay for. However, all your talk is in theory...have you experienced this yourself? I've had my HKS downpipe for over a year and I have not experienced any of what you mention. When I let off the gas, my turbo spools down just fine, and I don't get any boost spikes. This is all in accordance with not just my butt-dyno, but also with my boost graph on my SBC-ID. Maybe my SBC-ID helps this run smoothly, but nonetheless, I haven't experienced anything regarding "less control over the turbo" and "possibly dangerous boost spikes."hippy78 said:"It's not a bellmouth (similar to stock design) and it's mild steel, not stainless. If you have no plans to upgrade your turbo, this should suit you just fine."
This downpipe gets so much talk on here, it's not even funny. I agree that for the money, it's not so bad, but imagine this. With a bellmouth or divided wastegate downpipe, the exhaust gases coming out of the turbo have a lot of room too move and get going down the pipe. With the hks downpipe the exhaust gasses don't. This means that there will be more turbulence, and when the wastegate opens, it will not vent the exhaust gasses as well as a pipe with a bellmouth or divided wastegate port. The long and short of it is, even though the hks downpipe might not slow down how fast your car buids boost, it will slow down how fast it lets the turbo lower the boost. This means less control over the turbo, less performance, and possibly dangerous boost spikes. Sometimes, you get what you pay for...
I already have plans to get a better downpipe, since I'll be upgrading my turbo soon. By no means am I arguing against the fact that the HKS downpipe will provide less performance that a bellmouth or divorced wastegate downpipe, but as I said, neither he nor I have experienced boost spikes, boost creep, etc...so go figure.hippy78 said:"You're right, you do get what you pay for. However, all your talk is in theory...have you experienced this yourself?"
I got an hks downpipe as soon as it came out cause it was so cheap. It worked ok, spiked a bit. Got a new turbo, boost spikes everywhere, boost creep, and what not. Got the perrin downpipe, problems solved.... You can tell your friend from me that he would be able to build boost faster and safer without overboosting if he had a different downpipe. This is cause almost every downpipe on the market that has no cats will help the turbo control boost better then the hks downpipe. I am not talkin theory, I had one for almost a year. Maybe you should try out a downpipe other then the hks downpipe and then give your opinion?
It looks like mild steel to me as well but how come alot of vendors and HKS USA themselves say that it's stainless steel?Verdugo said:I've had the HKS downpipe since it came out last year. It's not a bellmouth (similar to stock design) and it's mild steel, not stainless.