SKU: 01-156-00956-3
US shipping included: the displayed price includes $65 shipping for the complete system. International orders require contact for an accurate shipping quote before purchase.
Weistec M156 Long Tube Headers & Exhaust System
For M156 6.2L V8 applications, this system replaces the restrictive factory manifolds with stainless-steel, TIG-welded long-tube headers using 2-inch primaries. Included are 3-inch midpipes, a 3-inch X-pipe and exhaust manifold gaskets. Factory resonators and mufflers are retained.
Designed with appropriate O2-sensor placement for naturally aspirated and Weistec Stage 2/3 supercharged builds. Weistec reports typical gains exceeding 90 wheel horsepower when combined with its ECU upgrade and high-flow filters; those components are not included, and results vary. Headers alone do not guarantee these gains.
Fitment & installation
Select C63, E63 W211, E63 W212, CLS63, ML63 or CLK63 Black Series. M156 and left-hand-drive vehicles only. Some applications require welded connector pipes; professional installation is required. Photos are representative and system layout varies by chassis.
Include your VIN, model year and body style in order notes for fitment confirmation before fulfillment. Do not assume compatibility with other engines or right-hand-drive cars.
Lead time
Weistec currently states an approximately four-week lead time. This is an estimate, subject to supplier availability; contact Zefer for current timing.
Use restrictions
Not legal for sale or use on pollution-controlled motor vehicles. Intended only for permitted competition applications. Purchaser and installer must verify applicable requirements before ordering or installing. California Proposition 65 information.
Terms, returns & warranty
We follow applicable Weistec supplier terms together with Zefer Performance's terms. Eligible unused returns must be reported within 30 days of the original invoice, require authorization and original packaging, and carry an 18% restocking fee. Shipping is nonrefundable. Installed, altered or modified products are not returnable. Special-order/custom-made parts cannot be cancelled or returned, and their deposits are nonrefundable. Weistec states a 5% cancellation fee for qualifying processed orders cancelled after the same day or outside business hours.
Weistec's branded-product limited warranty is 12 months with valid registration, subject to its exclusions; it does not cover installation labor, shipping or damage to other vehicle components. Contact Zefer before returning any item.
Review the full Weistec Terms & Conditions, Shipping & Returns and Limited Warranty, plus Zefer's checkout terms, before ordering.
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