RSi Tuning makes
19WHP and
18WTQ overall peak – Gains of
24WHP &
36WTQ at 3500RPM!
ORDER NOW *Group buy pricing only applies to the first 25 units sold; after first 25, price may increase.
RSi Tuning Introduces the one and only 3.5” Catless downpipe for the F10 N55 platform - Made completely in the USA from 304SS. This direct bolt-on exhaust pipe eliminates the primary catalytic converter and relieves pressure behind the turbo. This decrease in pressure allows the turbo to spool more efficiently, causing an increase in performance and better fuel efficiency during economic driving. You can audibly hear the difference as the turbo spool becomes more present and turbo lag is practically obsolete.
Performance Gains
Right away you will notice improvements in throttle response. Turbo lag is minimalized and higher peak boost levels are achievable with tuning. Dynojet numbers from EAS show an increase of 19WHP and 18WTQ – a 6.5% increase over stock.
*NOTE* The F10 N55 ECU is extremely sensitive to changes; without tuning the computer is a huge limiting factor – much more so than any previous BMW ECU. With the downpipe installed on 78MAO’s car (un-tuned), the dyno numbers were erratic and inconsistent. This inconsistency shows that the ECU is constantly monitoring and making adjustments to ensure factory output – Removal of the factory catalytic converter dramatically changes the air fuel reading to the oxygen sensor and causes the computer to limit boost and pull timing since it is outside of the programmed limit. These problems are eliminated with Juice Box or your choice of performance tuning.
Exhaust Tone
Along with the audible sound of the turbo building boost, the exhaust gains a much more aggressive tone. Decibel ratings remain below 90db and slightly above stock with the OEM exhaust. Listen Here:
Quality
All materials are from US suppliers and the downpipe is completely assembled in the US. Made of 304SS and tig welded to perfection! No additional hardware is necessary – installs using factory hardware. DIY included upon purchase.
Ordering/Shipping Information
Group buy pricing will be honored for the first 25 sets. Options for ceramic coating are available as well as bundle saver pricing with JB Stage 1. Pipes will be shipped in 2 to 3 weeks as they are currently being manufactured. Standard sales tax applies to CA residence.
ORDER HERE *Group buy pricing only applies to the first 25 units sold; after first 25, price may increase.