Super Sprint Down Pipes W/Front Connecting Pipe
Peak wheel-hp 290 @ 6234 rpm
Peak wheel torque (lb-ft) 295 @ 3576 rpm

*Pros
100 percent T-304 stainless steel mandrel bent piping 100-cell HJS high-flow catalytic converterDownpipes feature integrated flex joints to ensure longevity Precision flanges ensure direct fit and sealing

*Cons
No support brackets on the downpipes No extender harness for O2 sensors

*Parts: Downpipes, right and left connecting pipe with 100-cell cat, hardware

*Tools: 8mm, 12mm, 13mm, 14mm wrench and socket, ratchet, swivel for ratchet, long flathead screwdriver, O2 sensor socket or 22mm wrench

*Price: $5,947.77

*Installation time: 3 hr.

*Notes
Supersprint downpipes can be used with the stock exhaust, but the problem is the elimination of the primary catalytic converters, which sets off the 'check engine' light. This is why we opted to install the front connecting pipes with the 100-cell HJS converters, since they have a provision for the re-location of the rear O2 sensor. With the complete set-up installed, it's like removing a cork from a bottle; you can just feel the turbos spool. This set-up would definitely support higher boost levels. Eliminating the catalytic converters in the engine bay helps to lower underhood temperatures. The overall sound level increases, but not enough to cause any annoyance.

*Conclusion
The 335i is a force to be reckoned with, sporting plenty of horsepower and torque. These basic bolt-on modifications have demonstrated that this is just scratching the surface. To say the twin turbo 3.0-liter engine has potential would be an understatement. Even though tuners have not had this engine for long, the results look promising.

Since no intake upgrades were available at the time of testing, we removed the airbox's lid and filter to maximize airflow. After a few dyno runs, the 335i showed no gains or losses of horsepower or torque, so we concluded that the stock airbox can support the engine's CFM demands. The Split Second Turbo Tuner combined with the Supersprint turbo-back exhaust has transformed this stealthy four-door sedan into the true definition of an ultimate driving machine.

SOURCE
Split Second Supersprint NA
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