N20 Downpipe - F30 320/328iHIGHLIGHTS Gain up to 17whp 25wtq Faster Turbo Spool Improved Exhaust Note Upgrade to Stage 2+ Tuning SS304 Stainless Steel PROFILE The ARM Motorsports N20 Downpipe is the best hardware upgrade to get the most power from your 320i or 328i. The N20 has a stock downpipe with a catalyst that drastically restricts exhaust flow. This limits not only the amount of power N20 can make on the stock tune, but also prevents upgrading to a stage 2 tune due to
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