That's not right either. I would be surprised if the primary cats cost more than 5 HP. Removing the secondary cats only gains about 2 hp.

 

how much are they ?

 

how do you buy them?

 

I emailed the company with some questions about availability for a AWD.

The reply...




I haven't tested the header on a AWD car so I don't know if it will fit or not. The car sounds 100% stock with my header. Yes there is a CEL, I am working on getting rid of it. Here is the dyno from an IS250 6 speed
http://www.mazzurisuper.com/images/is250_dyno.jpg .
They will go on sale tomorrow and there are no instructions that come with. Installing these is very very hard, it took me about a day, just instructions will not help you need experience.

Daniel

 

^^^ This makes a whole lot of sense!!!!!

No offense to the poster, but I just can't believe it......

 

I'm just wondering...shouldn't there be a collector of some length and the O2 bung be in it instead of just on one of the header tubes?

 

ahhh. Joe Z are you the same Joe Z on the other Lexus website "MY.IS"?? If you are, then you can read the post by Daniel under his vendor forum.

If you are not, then here is a response by Daniel with regard to a dyno inquiry:

Inquiry Posted by Tommyboy2007:
will you have the dyno done for the IS350 before you start selling the headers?

Response Posted by Daniel:
After seeing the final results from the 250, I no longer have any plans to dyno the 350. I am very confident it will make huge numbers."

 

There is only one "Joe Z" and I am the same Senior Mod on MY.IS as well...


My statement remains the same.. I can't believe NO DYNO #'s for the IS350 ..!!

 

and thats why axel back exhausts make about 2 hp and cat backs w/ 2nd cat removed make much more? you can't tell me its just the piping and better resonators...

 

There is no dyno, because there is no need for one. If I was able to pull 31 wtq and 23 whp out of the 250, my experiance and common sense tells me the numbers will be even bigger on the 350.

A dyno would be needed if I dynoed a 350 to show how much less the 250 would make, but in this case even if it makes the same power (which it won't) those are still great gains from just a header.

 

There is a lot more to making a header than just removing a cat. My is300 system makes a lot more power over all the other headers on the market, which also remove the cat.

 

In general after the dyno I saw how restricted our motors are, electronically and physically. My guess is that Toyota did this, so they can easaly increase the power of the car to keep up with the competition when needed.

If someone finds a way to tune the car, especially play with the timing, there is gobs of power in this engine.

 

NJ only plugs the OBD port and runs the system check on OBD-II cars (96+). I had a boosted MR2 before my IS350.

Also, I ran a test pipe (no cat) on my MR2 as well. I didn't want a CEL on my car either and found a cool mechanical trick from another forum without using resistors. What you do is buy a pair of Spark Plug Non-Foulers and drill one out with a 1/2" drill bit. Then you screw in the O2 sensor in the drilled fouler than screw on another fouler onto that one. This block most of the gasses from the sensor to think it's clean but still gets hot enough to think its plugged in. Here are some pics I found online.

Pic of a non-fouler


Pic of it installed

 

Looked into the Non-Fouler trick and it seems to work on various cars. Wonder if it would work on ours??????? hmmmmmmmm

 

Daniel,

I'm sorry, buy your logic is not correct.
Research my extensive Intake Dyno Testing on both the IS250 & IS350.

As I prospective buyer of a Performance part for my IS350, its common sense that a Dyno should have been performed on the IS350. Not to mention that R&D, fitment testing, and at least a few weeks of driving with the headers, should have been done on both models.

I am not trying to give you a hard time.. I am just trying to give you some free helpful guidance here....

Joe Z