Manifold

[jujun]

Just out of curiosity, has anyone touched this part of the car just yet? I've just came back from a professional exhaust welding garage after asking him for a quote for a custom manifold, but sad news came at the end after he put the Z up the ramp. It's nearly impossible to get to it without taking the entire engine out, and also it's nothing he's ever seen before he also said - the shaping of it etc.
Anyone care to share some knowledge on this?

[TinTin]

manifold? exhaust manifold? Its cast into the block. You're SOL.

the best you can do is a downpipe/cat delete and make the car completely catless. which in some states and countries is illegal.

Also if a shop needs to pull the engine to see that, dont take your car there anymore.

[jujun]

Yeh I'm talking about the Exhaust Manifold.
I already have the P2R Downpipe bought from here, but flanges doesn't fit... so I thought since the garage were to build a custom exhaust manifold, he'd also be able to fix that flange.
The garage is popular and has an ace reputation, also having done my custom cat-back.

I could wait for the aftermarket companies have available in the future...

[MachVEvan]

Like stated before, the exhaust exits the engine from the head which is cast to include the manifold. I believe it exits in a rectangle flange. Thus meaning that there will be no option for an aftermarket exhaust header without replacing the entire head. It's a shame, but this engine wasn't built with the aftermarket in mind.

[RedefinedCRZ]

Yeah, the only thing you could do is pull the head off and port away.

[northbridge]

Originally Posted by MachVEvan

Like stated before, the exhaust exits the engine from the head which is cast to include the manifold. I believe it exits in a rectangle flange. Thus meaning that there will be no option for an aftermarket exhaust header without replacing the entire head. It's a shame, but this engine wasn't built with the aftermarket in mind.

Rant: not only this motor, but the new k series and r18 motors all have the manifold cast. Honda is standardizing this design. Bummer

[TinTin]

Originally Posted by RedefinedCRZ

Yeah, the only thing you could do is pull the head off and port away.

no R18 people have done this to my knowledge. and they are the ones desperate for more power to keep up with the Si's out there.

I highly doubt that this would be worth it. Might gain you another 1 or 2 hp if you dont mess up. Far from an actual header upgrade.

[JCRZ]

Port and polish would your best bet if ur keeping in NA. And honestly I've discussed the cast head into manifold with friends and a huge part of me sees this being real beneficial in the long run for those k series guys going all motor. I thinks the flow capabilities would be much greater, time will tell.

[TinTin]

Originally Posted by northbridge

Rant: not only this motor, but the new k series and r18 motors all have the manifold cast. Honda is standardizing this design. Bummer

it MAY be possible that honda will put out a version of the LEA1 with a proper exhaust header for the CRZ Si. If thats the case i forsee many head swaps in order to run race headers and proper exhausts.

[Tbot]

Originally Posted by TinTin

it MAY be possible that honda will put out a version of the LEA1 with a proper exhaust header for the CRZ Si. If thats the case i forsee many head swaps in order to run race headers and proper exhausts.

They are not releasing a CR-Z Si. Someone posted it in the rumors/news about that make of a vehicle.

Boom, right here!