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On 3 Performance

On 3 Performance BMW N54 335i Top Mount Single Turbo System - T4 Vband 2.75 Manifold

On 3 Performance BMW N54 335i Top Mount Single Turbo System - T4 Vband 2.75 Manifold

Regular price $2,699.00 USD
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On3 Performance BMW N54 335i Top Mount Single Turbo T4 kit will now support On 3's larger 60mm and 67mm ceramic ball bearing turbo line.  This kit will be more focused on the customer wanting to support 550 – 800 crank HP. It starts with a completely custom designed manifold that is a 2pc design.  The On3 N54 manifold is designed from an extremely thick schedule 40 tubing and constructed of 304 SS. By making this unique manifold, it allow for a much easier install.

Most of the top mount n54 single turbo kits also require you to modify the factory coolant line as its routed through the same area where the factory turbos are.  Serious attention to detail was emphasized to this area and was built around it to retain the hard aluminum tubing. The manifold is designed to use the On 3  44mm v-band wastegate to control boost.  Out of the box your kit will be setup to make around 14psi on wastegate pressure.  Coming out of the wastegate, we have it setup to atmosphere. The 304ss dump tube routes down from the wastegate and terminates right at the factory exhaust connection.

ON3 Turbo

This system was designed around two of On 3's already popular turbochargers that have powered other platforms into the 8's in the quarter mile. The first option is going to be the On 3 60mm T4 series turbocharger.  If you are looking for the quickest spooling option and sticking to around 500-650hp range, this will be the option for you.  Although spool time will be almost identical(~300rpm slower), the On 3 Performance 67mm is the top shelf and will yield the highest HP that we can offer. You will be able to select when ordering your system between both options.

This exhaust housing was designed and cast specifically for ON 3 line of turbochargers and best of all it is v-banded inlet and outlet.  With any tight engine bay, this is key to allow for endless adjustments.  This will not only look great but when the install time comes, it will make life that much easier.


Moving the air out of the turbocharger is a 3″ downpipes made from 304ss.  This will take the gases back to the factory exhaust location and splits into duals.  Included in each kit are the necessary stainless steel v-band clamps to secure the turbo in place. Downpipes as well as the needed clamp for the turbo manifold.


To make the kit that much easier to install, billet fittings are included to plug and route the flow of coolant and oil. When removing the factory twin turbos, they will leave oil ports for supply, draining as well as water passages used for cooling the stock units..  The included fittings are made to do the following:

  • Billet Plugs Factory Water Ports
  • Billet Plugs For Factory Oil Supply Ports
  • Billet Plugs For Turbo Water Drain
  • Billet Plugs For Factory Turbo Oil Drain
  • Custom Billet Oil Supply Fitting for New On 3 GT Series Turbo
  • Custom Turbo Oil Restrictor Fitting
  • Custom Billet Turbo Oil Drain (Into Engine Block)

Cold Side

To address the cold side, a short 2.5″ charge pipe is included to connect the turbo to the massive 7″ core On 3 Performance air to air intercooler upgrade.  In order to maximize power to redline, the IAT’s with the factory intercooler will become a problem.  Airflow surpasses what the factory air to air will handle and start delivering hot air to the engine.  As that warms up, the computer starts pulling timing and that will become a power loss.  Cool the air with the new 7″ On 3 Intercooler and your not pulling timing, air temps drop and everything is good.  Although that is all that is required to get the car running.

A throttle body charge pipe is included with each turbo system standard at no additional cost.  This is a 3″ polished aluminum charge pipe and also intergraded in our 50mm On 3 Performance blow off valve flange.  Each system will come with the 50mm On 3 blow off valve, this will not only sound good but fight compressor surge.  Most will look at this feature and like it for the sound but its a very crucial piece to a turbo system to keep the turbo safe.  A map sensor bung is also welded in so its ready for a plug and play install.

Another touch which was not required was the power steering reservoir.  A custom billet aluminum fabricated reservoir which contains a custom washable filter element.  This is simply a nice dress up item to the engine bay, clearly not required but looks sleek and how BMW should of produced the car.


  • The exhaust manifolds turbo flange is a T4 Vband, with a diameter of 2.75. Make note of this in case you want to use a different turbo in the future.
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