Why arent companies making headers and or intake manifolds

[TheDeathDealer]

Originally Posted by baylor1er

One thing I haven't seen mentioned on here yet is that our exhaust manifolds are designed specifically for our TD03 turbos. If anyone ever changes there turbos for larger twin setup such as TD04's or something else, they will have to have custom manifolds made. Eventually there will be a need for aftermarket manifolds and I'm sure the companies will see this. But since there is no demand for them, there is no need for companies to invest their time and $$ into R&D. Also since there is still HP to be found with the stock turbos and engine setup, I feel most people will upgrade the turbo internals long before they decied to change out for larger turbos.

If you know a good welder it wouldn't be hard at all to weld a different exhaust flange on the stock one

[BrokenVert]

Originally Posted by TheDeathDealer

You do realize the stock turbos spool at like 1700rpm, correct? There is no real world gain on this car for any aftermarket exhaust manifold. So what if equal length will make it spool 100rpm faster, you will never take advantage of it.

PS: equal length headers are more important on N/A engines looking to sap every last tiny amount of power out of a car. Equal length tubes versus them being a couple inches off of each other (on a ~600whp big block) will only gain a handful of hp at redline.

Minor for sure.

I am fully aware of the specs of the turbos. However I didn't mention power anywhere. I simply mentions efficiency (which would allow a slightly broader powerband) and most importantly a decrease in vibration, that makes the turbos last longer and produce less heat.

And greater flow efficiency always has a positive effect and not a minor one

[TheDeathDealer]

The turbos are too small in this case to make that difference though. With a larger turbo it would be a helpful tool in trying to get it to spool close to stock.

[IGoFast1589]

Originally Posted by akak1997

Also, base on a lot of tuners comments, the N54 actually can't support more air because our fuel system sucks, until that is resolved, it doesn't matter if you've air filter bolted directly on the turbos, and exhaust venting in 4" pipes.

I am not surprised 135i fuel systems weren't designed in order to support over 450 whp when the car comes with so much less from BMW. The fact that people do tunes and make 60+ whp and 70+ wtq without any issues at all is impressive on its own.