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In my experience head work is really only beneficial when pushing HIGH volumes of air. I should reiterate. Porting is only beneficial with large turbos and lots of volume. Polishing usually always benefits if done correctly but results are minute in well engineered heads. I would never port...

The angles of the cat pipe look so similar though. But I agree the headifold design probably sits closer to the block.

Looks like there is already existing catless downpipes that look like they will fit. https://m.ebay.com/itm/REV9-16-BMW-B58-3-0L-TURBOCHARGER-DOWNPIPE-CAT-LESS-340I-440I-740I-BOLT-ON-F32-/282034432528?_mwBanner=1&_rdt=1

s219. I guess we are confused because we have been told time and time again Toyota tuned this engine. I understand now. I'm still confused why BMW switched to the non headifold design for u.s. spec z4. Is the exhaust still water cooled like the supras?

S219. 34 hp if I remember right. Tq is nearly identical. I think the supra manages power/traction better it looks like. It probably wont keep pulling in the top end like it did. It beat it pretty good considering its suppose to be the same car.

Cant wait for a tune on this mkv. This thing will be in the 11 second territory. I'm impressed. Toyota as most of us know did their homework on this car. Haters will hate until the aftermarket makes it so they cant and that wont be long. It will be an aftermarket frenzy of parts. Long live...

Plus the white gets the red LE Interior. :D

If I had to guess this turbo would really like a couple more psi than what it's at stock. Stock is 10-11 psi estimated. I'd imagine it's more in its efficiency range around 12 to 18 psi. After that I'm sure it blows hot air.

This is interesting. This makes power with the higher b58D model in the u.s. spec z4.

The b58c and b58d make the same torque with dyno tests showing 34 more hp to the b58d. Wonder if the b58c will actually make more torque with faster turbo spool. Does the b58D in the z4 also have the three separate cooling systems like the supra's b58c?

What I'm wondering is if the fueling capability will be capable of more power in the b58c with the headifold because of not needing as much fuel to cool combustion chambers like the b58d.

How about companies like HKS. They already have MKV parts testing for only the supra. How about all these companies that already have a car on order just for engineering/manufacturing aftermarket parts.

Here is the B58D or O model

Here's the B58C or M model

Nice. I'll have to check it out

The new civic type r uses a 4 into 1 headifold. Makes power with a tune pretty easily from what I've read. On bimmerpost I heard the newer M cars will be doing a headifold also. I think Toyota wanted the best possible scenario to reduce emissions. Since that's why the mkiv was forced out of...

B58C supra

B58D z4

Yes you are correct the B58D in the z4 uses the regular style manifold. I dont think I care for the pieces of flex it integrates into the manifold for the end cylinders I could see the flex pieces being an issue over time.

I've seen that the estimated turbo is at 10-11 psi. Should be good for atleast 15 I'd imagine. Every 1 psi is good for around 10hp.