FAQs - N55

Check out this page for answers to some of our most Frequently Asked Questions regarding our N55 kits. We will continue to update this page so check back often. (Last Updated: June 2021)

1. Do you have N55 kits in stock?

  • All of our N55 EFR and External Wastegate kits are made to order and generally require a 4 to 6 week lead time, largely due to turbo availability from the manufacturer.

2. What are payment options?

  • You can purchase your kit through our website for shipping within the United States via credit card, paypal or Affirm. We also accept bank wire transfer. For wires and instructions, email jeff@speedtech.com or support@speedtech.com 

3. Do you ship overseas?

  • If you need to ship outside of the United States, we can ship direct to you. However, we recommend using a forwarding service in order to save on shipping costs. Due to size, weight and value of our kits, our overseas shipping rates are very costly. (www.MYUS.com is one of the forwarding services our current customers have used.)

4. What is included in a SpeedTech N55 EFR turbo kit?
Included with our SpeedTech EFR Turbo Kits are the following: (Check out our Shopping page for info/pricing)
  • BorgWarner EFR Turbo (Visit BorgWarner EFR Turbos's for more information on the their EFR Turbo line)
  • Cast Exhaust Manifold (divided for twin scroll), ceramic coated

  • Stainless Steel Downpipe

  • RH Engine Mount

  • Waterpump Mount Bracket

  • Coolant Hoses and Billet Fittings

  • Oil Lines and Billet Fittings

  • Aluminum Turbo Inlet Tube Fitting/bracket

  • Silicone Turbo Outlet Tube

  • Silicone Couplers

  • Intercooler Billet Adapter

  • WG Bracket and Linkage Assembly

  • Required Fasteners and Hose Clamps

  • V-band Clamp

  • Full instructions

5. I'm trying to keep costs down, can I run a hybrid turbo instead of the BorgWarner EFR turbo on the N55 EFR kit?

  • Our SpeedTech manifold and the EFR turbos are designed appropriately to run anywhere from 400-900hp, as opposed to the small stock manifold which will limit you to a range of less than 500hp (less than 450 to reduce chance overspinning the small shaft/bearings/seals). Many of the people buying our kits are tired of replacing hybrid turbos due to running beyond capacity and damaging seals/bearings/etc. (likely because it is not designed to flow much above stock hp). Most people don't realize how good the BorgWarner EFR turbos are. There is a reason they cost over $2,500 USD and are more than twice the cost of any other turbo available for other N55 kits. Link to more info on the BorgWarner EFR Turbos.

6. How much do your kits cost?

  • N55 EFR kits - start at $4,400 USD + shipping for the BorgWarner 7064/7670, $4,900 USD + shipping for the BorgWarner 8374, $5,000 + shipping for the BorgWarner 9180 kit or $5,050 + shipping for the BorgWarner 8474 kit. See our Shopping page for further details. Please keep in mind, our N55 Stage 3 kits use a $2,500 USD BorgWarner EFR turbo, not a smaller, lesser quality journal bearing turbo. When adding in all of the other kit components, plus the EFR, these prices are our best available and are currently already discounted.

  • N55 External Wastegate kits - pricing varies depending on choice of turbo. See Pricing - N55 External Wastegate Kit Pricing 
7. What will I need to do to hit 600whp with your N55 EFR kit?
  • To hit 600whp, some additional fueling will be required, and we recommend a port injection setup running either straight E-85 or methanol. We have found that running pump gas, with either E-85 or methanol in the port injection, is a great daily driver setup that can get you beyond 700whp.

8. How do I know what turbo to pick for the External Wastegate kit to achieve my whp goals?

  • For the N55 External Wastegate kit there are many different options to choose from with a wide variety of whp capabilities. The figures on the WHP charts are based on running e85 or similar octane fuel. If running pump gas only, we suggest multiplying these horsepower numbers by 0.70. This will help you determine what turbo kit will best fit your goals.
  • Example: BW S369 max of 950whp on e85, whereas on pump gas max of 950 x 0.70 = 665whp.

9. Will your N55 EFR Turbo kit fit on an E-chassis N55? If so, what are the turbo options?

  • Yes, our kit will fit an E-chassis N55. The EFR turbo options for E-chassis cars are: 7064 (550whp) and 7670 (650whp). The 7670 is the largest EFR that will fit. 

10. Do the N55 Turbo kits fit RHD cars?

  • No. Unfortunately, RHD fitment is not verified as we have only run our kits on LHD cars.

11. Will your N55 kits work on a N55 M235i?

  • Yes, the EFR kit will fit a M235i chassis as it shares the same parts as the F30 chassis. Turbo Options are: 7064 (up to 550whp), 7670 (up to 650whp), 8374 (up to 750whp), and 9180/9174 (up to 950whp) for this chassis. 

  • The N55 External Wastegate kit should fit the M235i as well, as we have installed this kit on F30 cars, and from what we know on our EFR kits, the M235i should use the same parts.

12. Are your N55 kits compatible with a N55 135i?

  • Yes, our EFR E-chassis kit will fit the E82 chassis. Options for turbos on the E chassis N55 cars are: 7064 (550whp), 7670 (650whp), 8374 (750whp) and 9180/9174 (up to 950whp).

  • The External Wastegate kit will also fit.

13. Will your N55 EFR kit fit a M2?

  • Yes, as long as it is not the competition version (S55 version) our kit will fit. The EFR 7670 and smaller turbos fit well, while the 8374 and larger are a tight fit between the manifold and RH frame rail. We have had a handful of customers run the 8374 in the M2 chassis but want to be upfront about the tight clearances in that platform. 

  • We also have the N55 External Wastegate kit that works with the M2. It has many different turbo options and it packages better due to running the external wastegate.

14. Will the N55 kits fit a BMW 335i N55 xdrive?

  • It depends on chassis and desired turbo. Options for turbos on the xdrive are: 7064 (up to 550whp), and 7670 (up to 650whp). Due to xdrive subframe differences, the 8374 and larger require re-routing coolant lines and waterpump, different from our kits. We do have F30 customers running the 8374, but modifications to the coolant hose routing, mount bracket, and intake tube need to be made by the end user in order to fit.

  • The External Wastegate kit will also fit the N55 xdrive 335i vehicles.

15. Will the N55 EFR kit fit a E-82 N55?

  • Yes, the N55 kit will fit the e-chassis. Options for turbos on the E chassis are: 7064 (up to 550whp), and 7670 (up to 650whp). The N55 External Wastegate kit will also fit the N55 E-chassis.

16. Will your N55 kits fit a 535i?

  • Due to the differences from the 335i to 535i, our kits would need to be adapted in a few ways to fit the 535i. For our 535i customers, we could offer you a "tuner" kit of sorts, with the manifold, downpipe, oil lines, coolant lines/hoses, charge pipe, partial intake, etc. That would get you most of the way there, but then you would have to do a bit of fabricating work to do final fit up for the downpipe, intake, and rh motor mount.

17. Can I buy just a N55 manifold?

  • No, at this time we are not able to sell the manifold separately. Due to the rate of our manifold production, all manifolds are reserved for kits.

18. Can I buy a N55 kit without a turbo?

  • YES, we have an External Wastegate No Turbo Kit or we will sell the BorgWarner EFR kit without a turbo if the kit is compatible with your car.  

19. Will there be any clearance issues with your N55 EFR kit?

  • There are no clearance issues with any of the F-chassis cars.

20. What type of fueling/additional modifications are recommended to run with your N55 EFR turbo setup?

  • We recommend a port injection kit for the additional fueling, plus a higher flow intank pump, or run a separate pump to feed either E-85 or Methanol to the port injection. If you go that route, you can probably leave the stock LPFP as is. If your goal is 550whp, you'll need some secondary fueling, best bet is a port injection kit, where you have the option of supplying it from its own methanol tank, or connecting to the stock tank. If you connect the PI to the stock tank, you'll need an upgraded LPFP also.   

21. What are the EFR turbo options for the F30 N55 kit?

  • Turbo options for the F30 chassis are: 7064 (550whp), 7670 (650whp), 8374 (750whp), 8474 (900whp) or 9180/9174 (up to 950whp). 

22. I saw a dyno of a hybrid Stage 2 and LPFP stage 2 with E-85 and it came out to like 460HP, will your N55 EFR kit make more HP than this? 

  • Yes, you'll make more power per psi with our kit than any hybrid option, as the EFR turbo and our manifold are both sized correctly for 400-900hp options, as opposed to any hybrid with the small stock manifold. Our manifold cross sectional area is literally 3 times bigger than the stock manifold you'll find with the other options. See Below Image:


 23. Do you have install instructions for your kits?

  • We provide full color instructions with the purchase of our kits and we are available for questions as well by emailing us at: jeff@speedtech.com or support@speedtech.com. Due to sensitive nature, we do not provide electronic copies.

24. Do you have dyno data for your N55 EFR kits?

  • Yes, see the N55 Product page for dyno data.

DOWN PAYMENT TERMS & CONDITIONS (effective as of February 1, 2021)
Due to the varied and sometimes lengthy lead time on the turbochargers from the different manufacturers, SPEEDTECH offers a "Down Payment" option. Once we receive a Down Payment order, the customer specified turbocharger order is placed. When the turbocharger is received and the kit is ready to ship, a promo code is emailed to the customer to complete their kit purchase. Once a notification email has been sent requesting final payment with the accompanying promo code to deduct the down payment, payment needs to be made within 4 weeks. All kit orders need to be finalized in a timely manner. If final kit payment is not received within 4 weeks, the order will be canceled and the customer will be refunded their Down Payment minus 25%. 

If you have an issue with your turbocharger, all warranty issues are handled directly through the turbocharger manufacturer as SPEEDTECH does not modify the turbochargers in any way.

All parts come with a limited warranty and will be resolved on an individual basis by emailing us at support@speedtech.com. This guarantees SPEEDTECH parts to be free from manufacturing defectsWarranty applies to the original purchaser only.

At SPEEDTECH we stand behind the quality products that we sell. While most kit parts are interchangeable between their specific platforms, each kit is also tailored to the specific end user and includes customized components. If for some reason you want/need to return your turbo kit, the following will apply:

  • RETURNS: No Returns are allowed on any product after 30 days from the date you receive your purchase. To be eligible for a return, your purchase must be unused and in the same condition and original packaging as when you received it. All returns require a Return Materials Authorization (RMA) and a receipt or proof of purchase. Email support@speedtech.com for return details and to receive your RMA number. If you do not have a RMA number, your return will be marked return to sender and your return will not be processed. You will be responsible for paying for your own shipping costs for returning your Service. Shipping costs are non-refundable. We cannot guarantee that we will receive your returned item and therefore, due to the high value of all products, you are required to purchase shipping insurance for returns and you must use a trackable shipping service. If your return is not received and a claim cannot be filed due to lack of a tracking number and/or shipping insurance, you will not be issued a refund. As all products are made to order a 25% restocking fee applies to all returns.
  • REFUNDS: Refunds (if applicable) Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund. If you are approved, your refund will be processed, minus the 25% restocking fee that applies to all refunds and a credit will be issued to your original method of payment, within 10 business days.
  • CANCELLATION: If for any reason you wish to cancel your order before your Service has shipped, you will be issued a refund minus a 25% restocking fee. If your Service purchased was a "turbo kit" and you paid in full, you will receive a refund minus 25% off the cost of the turbocharger. If you purchased a down payment toward a turbo kit, you will be issued a refund minus 25% from the cost of the down payment. Once your Service has shipped, the order cannot be cancelled, refer to Return policy above.