What the hell is the reason for people always using stock manifolds? Sure we all know stock is good enough, but why don't more people/vendors make better flowing manifolds? Sure they can get really expensive, but the power we can make for the cost is pretty Damn good.

I remember seeing a full manifold that has the semi peripheral port integrated in the manifold itself, four fuel rails (fuel, water/meth inj), two-runner upper intake, single TB, and it was get high quality. It ran about $1800 but the flow was flow bench tuned and equal length (stock lower intakes are not equal length) and dramatically increased the power of the 13B.

Here's the link to them, I'm just curious why we don't see more of this in our cars. The market would be so much more diverse with all these and imagine competing vendors.

SEMI PERIPHERAL INTAKE MANIFOLD

 

cause bros are cheap

 

Cost vs Gains

 

dying platform, making a cast mold versus one at a time, numerous reasons really

If someone came and said they would make them with 10 people committing I wonder how many would actually pay up?

 

On a turbo engine, the stock manifold is good enough for up to 400-500hp even more.

I can see the need on a N/A engine since you want as much air in as you can, the stock n/a manifolds are limiting the power once you hit around 200hp since it was designed for stock ports. Not many people will pay the price for something like that when for that same price they can just go turbo.

 

black- i dont think its a question of how much power the stock stuff is good for.
Lets put it this way, if someone made a manifold, dyno tested on a 2-3 cars back to back with no other changes and you could gain 20hp to the wheels and improve torque/powerband, what would that be worth to you?

 

mainly because it would be aimed at naturally aspirated folks and the cost would be expensive for minimal gains on cars with very low resale value.

most n/a guys go turbo eventually anyways, the few who try to squeeze out n/a power are few and far between. you can find a fabricator and simply have them make you a manifold to suit your needs.

50-75whp on the upper end is easier and cheaper from other things, like nitrous.

i'd be a little peeved to spend weeks designing a manifold, making a few of them, marketing them and watching them collect dust on the shelf. the older manifolds were designed for engines with teeny tiny ports and had very restrictive intake and exhaust, they noticed major gains and that is why people actually spent $1k on a intake and carb.

 

I guess it all comes to cost.
How much would it go for?

20 hp is a lot for a N/A engine, especially for a bolt on.

 

if it were something that eliminated the auxiliary ports yet flowed to all and bolted to the stock throttle body i figure that might sell. something on the other hand that requires a carb or complete FI/throttle body probably is going to be more than most are willing to spend.

doubt anyone is going to make something for less than $500 and will require a way to tune it(EMS). how many people run an n/a with a standalone? i know of 2 off the top of my head out of hundreds of n/a customers. would either of those 2 buy an intake manifold? perhaps, even if both did that is a few hundred in profit for days worth of work. you see where the math doesn't really add up. most extreme n/a builds have full custom manifolds for their application.

plus, most of the restriction remains in the exhaust and not just the intake. the port wings in the n/a engines will hinder even the best flowing intake manifold as well as the 6 port irons running too much retard in port timing. there's just too many factors and the engine/tuning would have to be completely worked with a single goal in mind.

what i'm saying is: your mileage may vary. who is really going to buy a manifold that comes with a statement of "gains can be expected of 0-50whp"

 

Sorry for hijacking, but doesn't Excessive (sp?) LIM's fit the 13BT as well as the FD?