taejin09

can you post up pictures of your car with the exhaust?

Black350

It appears that the HKS cans are stainless and the piping is reg steel (dark) , according to picts I have seen. So wont these rust eventually? Thats the only reason why i am not sure about the HKS. I love HKS products though.

Gernby

iTrader: (1)

According to the GB thread about the HKS, the piping is "coated stainless 409". Honestly though, I don't think any piping material is going to rust out in less than 5 years. AFAIK, none of the stock exhaust is stainless.

lobuxracer

iTrader: (2)

The entire stock exhaust is stainless according to Lexus New Car Features.

iSuxeL

iTrader: (21)

I too would agree on jinetix's exhaust, awesome sound and love the way it looks, I have a carbon ti on my DC2 and I want the same on the IS350 with a custom axle back. Is there a reason why company's are only making axle back systems for the IS?

jman-is350

That's very nice gain. Congrats.

Gernby

iTrader: (1)

There are 2 companies offering manifold-back exhausts, but they are illegal on the road due to te removal of the secondary catalytic converters. I hate that Lexus did it this way, but there are 2 cats in the manifolds, and 2 more in the mid-pipe.

Black350

The Tanabe and Greddy have stainless everything, I am disappointed at HKS for the "coating" , It probably wont rust for a very long time, but more comfortable with full stainless. HKS still and has been my favorite tuner though.

Gernby

iTrader: (1)

Huh? Are you saying that "coated stainless 409" isn't really stainless? I figured it was just stainless steel paint on it.

Black350

Ithink it is a more mild steel, so they need to put a coating on it. Why wouldnt they just use non coated stainless steel then. Its probably a cost saving issue to use a milder steel w/ coating then full stainless. Thats what I think , I could be totally wrong.

clubfoot

I've had the Lexus HKS now for about three months and you will notice it progressively getting deeper in tone over a period of time and the tail pipe tips are huge! The Lexus HKS version is fully polished from flange to tip with impeccable welds through out and is uncoated. I thought it was just in my head but I also noticed the "lighter" throttle when I first drove it after changing the exhaust,...I also disconnected my battery to reset the computer because I noticed the exhaust was popping on over run in pwr mode?!

rroy

iTrader: (1)

What IS do you have... 350 or 250?

JiggaWATT

I have a IS350, I did not have a USB cable for my scanner so I was unable to post the dyno last night.

I will take pictures also when I get the chance.

RocketGuy3

iTrader: (1)

Damn, an 11 rear wheel hp gain??? That's REALLY good. Almost too good to believe for an exhaust that leaves all the cats in place.

Are you running stock other than the exhaust?

If Gernby's results are similar, I might just be sold on this exhaust.

EDIT: But I gotta say, I'm a little discouraged by the way you described the size of the tips... I mean, I don't want it to look ricey, like there's a couple of fart cans in the back.

Gernby

iTrader: (1)

Something else to keep in mind about the peak gains is that it doesn't sound like the car was driven at all after installing the exhaust. The long and short term fuel trims would not have had any time to adjust for the slightly leaner AFRs. This could have caused a temporary gain in power that will quickly be reduced as the ECU compensates with more fuel. Did the shop record AFRs for all of the dyno runs?