SPDZ1 4.5” Downpipes N20 2012 – 2017 BMW 120i, 128i, 228i, 320i, 328i, 428i F20/F21/F22/F30/F32/F33/F36

SPDZ1 4.5” Downpipes for BMW N20  (2012–2017)
Fits: BMW 120i, 128i, 228i, 320i, 328i, 428i — F20 / F21 / F22 / F30 / F31 / F32 / F33

Unleash True Turbo Power
The SPDZ1 4.5” Downpipe is precision-engineered to bring your BMW’s N20 & N26 turbocharged engine to life. By replacing the restrictive factory catalytic downpipe with our free-flowing 4.5” high-grade stainless steel design, you’ll experience sharper throttle response, faster spool, and a deeper, more aggressive exhaust note.

Key Features:

• Massive 4.5” Primary Design – Optimized for maximum flow and reduced backpressure

• Premium T304 Stainless Steel – Corrosion-resistant and TIG-welded for long-term durability

• Dyno-Proven Gains – Up to +25 HP and +35 lb-ft torque on a tuned vehicle

• Quicker Turbo Spool – Improves low-RPM torque and high-RPM breathing

• Mandrel-Bent Tubing – Maintains consistent diameter through bends for optimal airflow

• CNC-Machined Flanges – Perfect OEM fitment, no leaks, no guesswork

• Bolt-On Installation – Uses factory mounting points, no cutting required

Performance + Sound
On stock tuning, expect a noticeable bump in mid-range power and torque, with a throatier, more aggressive tone. Pair with ECU tuning for maximum gains and the true potential of your turbo.

Compatibility:

• BMW 120i / 128i (F20 / F21)

• BMW 228i (F22)

• BMW 320i / 328i (F30 / F31)

• BMW 428i (F32 / F33)
  For model years 2012–2017 equipped with N20