Audi S6 / S7 C7 Exhaust: Akrapovic Evolution Review

If you are shopping for an Audi S6 / S7 C7 exhaust, the Akrapovic Evolution Line titanium cat-back is the halo upgrade for the 4.0T TFSI twin-turbo V8. The C7-generation S6 and S7 (2013–2018) make 420 hp and 406 lb-ft in early cars and 450 hp after the 2016 C7.5 refresh, yet the factory exhaust muffles most of that character. This review breaks down what the Akrapovic system actually delivers — weight, sound, and fitment — and how it stacks up against the value-focused AWE Tuning Touring and Track systems we stock at NLP Performance in Tampa, FL.

What Makes the Akrapovic Evolution Line the C7 S6/S7 Benchmark?

The Akrapovic Evolution Line for the C7 Audi S6/S7 is a full-titanium, cat-back exhaust system — every muffler and pipe from the catalytic converters back is built from lightweight titanium rather than stainless steel. That is the single biggest reason it earns our top pick: it removes about 7.7 kg (roughly 17 lb) from the tail of the car, mass sitting behind the rear axle where it matters most for handling balance. The system finishes in four hand-laid carbon-fiber tailpipes and keeps Audi's factory sound valves, which are steered by electric actuators so the exhaust follows your drive-mode selection instead of droning at a fixed volume.

Titanium is not just a weight-saving gimmick here. Grade-for-grade it is stronger than the mild steel Audi uses from the factory, it resists corrosion far better through Florida's salt-air and rain, and it survives the 4.0T's exhaust-gas temperatures without discoloring into a rusty brown. Akrapovic develops these systems on the same benches that produce exhausts for factory motorsport and superbike programs, and that experience shows in the mandrel-bent pipe work, the CNC-machined tip clamps, and the precise weld quality. For an owner who wants the last word in materials and finish on a C7 S6 or S7, nothing else in the catalog competes.

How Much Power and Sound Does It Really Add?

A cat-back exhaust delivers its biggest wins in weight, sound, and throttle response rather than headline horsepower. Because the Evolution Line leaves the factory catalytic converters in place, it is a true bolt-on: no ECU remap is required and there are no check-engine lights. On the 4.0T TFSI V8 — 420 hp / 406 lb-ft in 2013–2015 cars and 450 hp in the 2016+ C7.5 — the reduced backpressure frees up a modest gain in power and torque, but the transformation you feel is in character: a deep, hard-edged V8 bark on start-up and full throttle that the muted factory system hides.

The magic is the retained valving. In Comfort or Auto the exhaust stays civil enough for a daily commute; drop it into Dynamic and the valves open for the full Akrapovic soundtrack. Titanium also rings with a brighter, higher-frequency tone than stainless, giving the S6/S7 an unmistakable exotic edge without the constant highway drone that plagues cheaper straight-pipe systems.

Here is what to expect through the rev range: at cold start the valves crack open for a sharp bark, then settle to a low, refined idle once warm and in a comfort mode. At a steady 70–80 mph cruise the tone stays behind the cabin, so long highway stints do not become fatiguing. Roll into the throttle and the 4.0T serves up a hard, layered V8 growl with crisp overrun crackle on lift. If your goal is a bigger power number rather than sound and weight, the cat-back is the finishing touch on a build — the real horsepower on the 4.0T comes from a downpipe or high-flow catted midpipe plus an ECU tune, and the Evolution Line pairs cleanly with that path since it bolts to the factory converter flanges.

Akrapovic vs AWE Tuning: Which C7 4.0T Cat-Back Is Right for You?

The Akrapovic is the no-compromise choice, but AWE Tuning builds two excellent T304 stainless systems for the same C7 4.0T platform at a fraction of the price. The Touring Edition uses AWE's 180 Technology resonators to cancel drone for a refined, road-trip-friendly note; the Track Edition swaps those resonators for straight pipes to get rowdy and loud, and can be converted to Touring spec later. Here is how the three cat-backs compare.

AWE lists both systems under the S7, but they are built around the shared C7/C7.5 4.0T exhaust layout — S6 owners should confirm the exact part with our team before ordering. Pick the Akrapovic if you want the lightest, most exotic-sounding option and titanium bragging rights. Pick the AWE Touring if you want a refined daily driver with zero drone, or the Track if you want maximum volume for the money.

A simple way to decide: if you keep cars long-term, track them, or simply want the best regardless of cost, the Akrapovic's titanium and resale cachet justify the spend. If this is a daily-driven S6 or S7 and you would rather put the savings toward a downpipe and tune, the AWE Touring is the smart-money pick — you get 90 percent of the presence for roughly a quarter of the price, with AWE's limited lifetime warranty backing the stainless build. The Track exists for owners who want the loudest possible cat-back and do not mind some cabin drone on the highway; because it converts to Touring spec later, it is also the lowest-risk way to try the aggressive route.

Does It Fit My 2013–2018 Audi S6 or S7?

The Akrapovic Evolution Line (part S-AU/TI/6H) is verified for the 2013–2017 Audi S6 Avant and Limousine and the 2013–2016 Audi S7 Sportback, all with the 4.0T TFSI V8. Both the pre-facelift C7 and the 2016 C7.5 refresh share the same rear-exhaust architecture, so the titanium system bolts to the factory hangers and mates to the OE catalytic-converter flanges. One important note: NLP Performance lists this Akrapovic system as not CARB-legal, which means we are unable to ship it to California addresses — California-registered S6/S7 owners should look at a 50-state-friendly option instead.

The Best Companion Mod: AWE S-FLO Carbon Intake

A new exhaust opens up the back half of the airflow path — pair it with an intake to do the same at the front. The AWE S-FLO Carbon Intake V2 replaces the restrictive factory airboxes with sealed carbon-fiber housings and high-flow filters, adding an aggressive induction growl under load that complements the titanium exhaust note. It is a bolt-on, no-tune-required upgrade for the same C7/C7.5 S6 and S7 4.0T, and at around $1,300 it is an easy addition to a full intake-plus-exhaust package.

Installation and What to Expect

Because all three systems are cat-back designs, installation is a straightforward bolt-on that an experienced DIYer can complete in roughly 1.5–2.5 hours with the car safely on a lift or ramps. You unbolt the factory cat-back at the converter flanges, transfer the OE hangers and sound-valve connections, and bolt the new system into place. No welding, no ECU flash, and no tune is needed — the factory catalytic converters and oxygen sensors stay put. We recommend anti-seize on the clamps and a final tip-alignment pass so the carbon or diamond-black tips sit evenly in the rear valance. Plan on a floor jack and stands or a lift, a metric socket set, a set of new clamps if yours are corroded, and a helper to support the muffler section during the swap. Torque the band clamps evenly and leave the tips slightly loose until the whole system hangs true, then snug everything down. Our Tampa, FL shop can handle the install and fitment check if you would rather have it done professionally.