BMW M135i Scorpion Downpipe and BMS Tips
The standard M135i downpipe catalytic conver is very restrictive. It accounts for a 20hp gain just from removal.
Scorpion manufacture both PWG and EWG turbo version downpipes. The early model being PWG doesnt allow for a huge exit but still allows good flow of the hot exhaust gasses post turbo.
But once fitted the free flow from the turbo can increase its response and peak power upto 20bhp. To account for the decat you will need a JB4 or NVM Stage 2 ECU remap.
This can ultimately take power upto 380bhp.
The stock Tips on the exhaust system are prone to corrosion and wear, so BMS tips finish the back en nicely.
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