BMW E82 E90 N54 decat downpipes + 5" stepped FMIC + high-flow inlets kit

For BMW 135i (E82/E88) and 335i (E90/E91/E92/E93) with N54 engines, 2006-2010. A bolt-on fast-road or track-day kit - no custom work needed.

• T304 stainless steel decat downpipes: TIG welded, laser-cut flanges, CNC-bent for flow and mid-range torque
• 5 inch stepped bar-and-plate FMIC with cast end tanks: drops IATs into the high 20s °C
• High-flow inlets: fluoro-lined silicone hoses, RamAir filters and alloy joiners - proven intake gains

All components tested together on N54 platforms. No OEM-replacement framing - this is a deliberate performance upgrade.