I have a few questions JBrady.
On a GS430 exactly what would I need to have done? Is the anything beside the custom Y pipe? Are all of my O2 sensors , other emissions and heat shields goona go on? Is there any estimate of how much longer?

 

Same ??? Plus will the check engine light be set off or not ??? Let me know also wat will the final cost of them be ???

 

I can't make any absolute "exact" statements before the parts are actually built. My best educated "guess" is that you will need to fabricate a Y pipe with or without cats to connect to the header outlets and center cat back exhaust. Your stock heat shields will not fit. In fact no provisions are being made for any heat shields to fit. The fact that these fit inside the 1998-2000 heat shields is a fitment and clearance concern only.

It is POSSIBLE that Lexus did not change the flange mounting locations between the 400 and 430 engines. They may have just changed the manifold layout only but kept the head to catalyst dimensions. If so, these would bolt right in. I am going on the presumtion that this will not work (although it may). Provisions for the O2 sensors will be made in the headers.

Any Y pipe will need to make provisions 02 accordingly. Some may opt to cut the catalysts and flanges from the stock Y pipe and use these parts to construct a higher flow Y pipe that will fit. Some may wish to keep their stock (expensive) Y pipe and fabricate a new one with or without cats.

 

I spoke to many muffler shops they want 500-900 to do a custom y pipe with cats also I have to bring them the car with the headers already on. Which means towing there.
So 430 guys
600 headers.
100 tow
300 install headers
500 - 900 custom Y pipe
1500-1900 to do on a 430?

 

For 20 additional HP? Somehow I cannot justify this performance mod. Kudos to you those who can!

 

Hameed - also remember this is 20 RWHP which is significant jump IMO. And with mods like this it isn't ususally just a shift in peak HP, its across the rpm range.


I'm hopeful for more than that and especially a nice TQ jump purely based on the Tundra dyno changes (this is marketing material, so probably is best case)

 

Thanks Dave for the info.

I think what would convince me is driving a GS that has this mod. I just don't know enough about such HP gains to truly appreciate it's effect. For all I know it could really make a significant difference based on what you and others have said. I will have to wait it out though.

 

What is the price of this again?
What kind of coating?
Can he get them jet hot coated?
Will they have flanges at both ends?
Are there any ill effects to losing the heat shields?
Do they come with gaskets?
When is the latest we can sign up fo this run?

 

imagine that gain when coupled with an intake and exhaust though, espicially tuned with an SAFC. the stock pieces are NOT the best engineered as prevously thought when no real gains were made with I/E. This engine is ready to be opened up and the headers are exactly the piece we need to get it going.

 

Answers after questions above

 

I confirmed that each RUN of headers requires a minimum of 20 sets. Will there be a second run? Hard to say. Time and demand will tell. I would suggest that these will be a limited production part and that anyone that buys a set will probably have no problem selling the set if needed for nearly the purchase price (or possibly higher depending on results and future availability). Even if you sell at a loss we are talking very minimum risk here.

As far as a custom Y pipe for 430 cars.

Option 1: Good cats can be had for $125 each. A good Y junction for $100. Flanges are tougher but would cost about $100 for the 3. Tubing and labor to connect the parts shouldn't run over $200. Cost for custom Y pipe with cats and flanges, about $800.

Option 2: Same as option 1 but without cats, about $400.

Option 3: Modify existing Y pipe to fit. Probably around $200.

Option 4: Cut flanges and cats from stock pipe and add 2.25" pipe and quality Y intersection, apx $300.

It would be nice to offer a bolt in Y pipe for these cars. It would probably require a different one for the GS430, LS430 and SC430. In order to do this someone would need to use their car as their car to pattern a system and then reproduce the part for sale. Again would be nice but I don't have a GS430 to offer.

 

I dont know what shops u guys go to, but where i live I can probly get the y pipe done for 250.00 without cats, you guys need to use old school hotrod shops not muffler shops.......

And fisher stop being a jackass, jbrady is doing what he can, if you dont like the idea dont buy them.

 

I don't think Fishy is being a JA, he's just.......cautious and has several questions. (some of which are in the 30+ pages of thread. .)

Love that dyno chart,........the fat (phat?) GS4x0 could USE some of that torque!! In the middle of the power band, it is TORQUE that pins you in the seat and makes the car jump. (for those that don't realize it...)

And Hameed, I certainly respect your position. This isn't a cheap mod, but then again neither is the Torque Convertor or the LSD 3.89 rear-end! Like one or two peeps have oh-so-briefly mentioned,.....the key to this being a great mod is that we know the stocker is restrictive, AND, adding power "through-out" the power-band is why it's a good deal. Consider the SRT intake that adds nothing or takes away from the low-end and some mid-range for a supposed 20hp gain at the upper rpm's.
Headers have been *THE* easiest, cheapest way to get HP for your $$$ since before I was born, and that was mid-60's.

Oh, I have to add that I find that $500 - $900 price for a custom Y pipe to be a bit steep also. From my experience, I would expect more like $200 - $350 without the purchase of new catalytic convertors.

Using the part that Lexus is already providing, and cutting it where needed is the quickest and cheapest way out, as Brady mentioned.

 

Hey Hollywood . I believe you are the first one to bring this thread to level of name calling. I believed that this forum was created to Exchange information. Some people like to get all of the info before they jump in to something that will cost me in my area around 2000 to complete 100%. I spoke to Kooks a maker of custom headers and they told me 2200 complete in stainless, and a couple hundred more to jet hot them. I was trying to find the best route for me. Is that OK with you HOLLYWOOD? Jbrady is a great source for info and I praise him for getting this going. .

 

I took no offense to Fishers post. Even though the info is in this LONG thread I thought it time for a quick refresher and hence the answers to the questions.

Regarding 20rwhp being worth the trouble. I guess that depends on each individuals personality. Another way to look at it would be, lets imagine the factory built the GS400 with headers like the ones we are planning. Lets further imagine that the engine was rated 325hp instead of 300hp (about 20rwhp difference) and the car was 3 tenths of a second quicker 0-60 and in the 1/4 mile. Lets consider that JUST before the cars where sold Lexus decided to place restrictors in the exhaust to reduce power by 25hp... for "insurance" reasons.... How many of us would PAY to remove those restrictors? Do I see a whole bunch of raised hands?

Well, imagine no more because that is ALMOST what Lexus did. Look at the manifolds on almost ANY other performance engined car and you will see MUCH better manifolds. Lexus must have wanted to restrict this engine. Heck, 6350rpm redline is NOTHING for a small displacement oversquare 4 liter engine with 6 bolt mains and a forged crank. The undersquare GM LS6 makes 405hp at 6000rpm with 10.5 compression. Our 1UZFE and 3UZFEs can easily run 7000rpm. Our valve lift is a paltry 0.300" and duration is nil. A little more cam, good exhaust and 7000rpm would make 400hp a realistic potential. Our intake manifolds are GREAT. Lexus may indeed have found these engines TOO powerful and actually detuned them with among other things LOUSY exhaust manifolds.