Active Autowerke F97 X3 M/F98 X4 M S58 GESI Downpipes

Active Autowerke builds this pair of S58 downpipes for the BMW F97 X3 M and F98 X4 M. Each pipe carries a 4.5 in GESI G-Sport ultra high output high-flow catalytic converter, and Active Autowerke says no performance tune is needed to run them.

The factory S58 downpipes are restrictive, which slows exhaust flow out of the turbos and slows spool.

NO CEL when using this downpipe GESI EPA registered high flow and fully OBD2 compliant EPA compliant for use on OBD2 vehicles (1996 and newer) except in California

What It Does

Turbochargers are driven by spent exhaust gas, and the quicker that gas leaves, the better the turbos respond. These downpipes open up flow right after the turbos for quicker spool and more power, with stainless flex joints and a step down to 70 mm to meet the factory exhaust. Active Autowerke never drops below the stock 70 mm diameter.

Materials and Construction

TIG-welded 304 stainless steel with cast stainless upper V-band clamps for a precise fit and a 400 cpsi catalyst substrate. They bolt on with no cutting or welding.

Features

• Pair of downpipes with 4.5 in GESI high-flow cats
• 400 cpsi catalyst substrate
• Stainless flex joints, 70 mm outlet
• Cast stainless upper V-band
• No tune needed, per Active Autowerke
• Bolt-on, no cutting or welding

Specs

• Part number: 11-070
• Brand: Active Autowerke
• Type: catted downpipes (pair)
• Catalyst: GESI G-Sport, 4.5 in, 400 cpsi
• Outlet: 70 mm
• Engine: BMW S58 3.0L twin-turbo inline-six
• Shipping weight (Active Autowerke): 50 lb (22.7 kg)

Fitment Notes

• Active Autowerke fitment applies to US-model vehicles only.
• Active Autowerke covers the shell and tube ends for 5 years / 50,000 miles and the catalyst core for 2 years / 25,000 miles for the original buyer. Excessive burble (more than stock) voids the warranty because it destroys the catalyst core.
• Questions before you order? Call or text (310) 231-0292 or email Online@AutoTalent.com.
• Shop all Active Autowerke downpipes, every catted downpipe we carry, or the full Active Autowerke range.

FAQ

Do I need a tune?
Active Autowerke says no performance tune is needed.

GESI or AFlow?
GESI uses GESI cats; AFlow uses Active Autowerke's own cats at a lower price.

Is it bolt-on?
Yes, no cutting or welding is needed.