Audi RS5 tuning means two completely different conversations depending on which RS5 is in your garage. The B8 RS5 is a high-revving naturally aspirated 4.2 V8 that makes its magic above 6,000 rpm. The B9 RS5 is a twin-turbo 2.9 V6 that responds to software like a golden retriever responds to bacon. Whichever you have, more speed needs more stopping, which is why our Haken Street rear big brake kit for the B8 and B9 RS5 belongs on the list before the second tune revision.
This guide stays on the RS5. For Audi's bigger V8 hammer, see our Audi RS7 tuning guide; for the supercharged 3.0T family, try the Audi SQ5 tune guide.
B8 RS5 vs B9 RS5: Two Engines, Two Tuning Philosophies
B8 and B8.5 RS5: 4.2 FSI V8 (CFSA), naturally aspirated
The first RS5 (sold in the US for 2013 to 2015) uses a 4.2-liter direct-injected V8 rated at 450 hp and 317 lb-ft, revving to 8,250 rpm, paired with a seven-speed S tronic dual-clutch (the DL501, also called 0B5). There is no turbo to turn up. Software alone can sharpen throttle response, adjust shift behavior, and trim some safety margin, but gains on a naturally aspirated engine are modest, because you cannot add air without hardware. The B8 RS5's hardware path is intake, exhaust, and transmission cooling; big numbers mean forced induction, which is a custom project, not a weekend mod.
B9 and B9.5 RS5: 2.9 TFSI twin-turbo V6 (EA839)
The B9 RS5 swaps the V8 for a 2.9-liter twin-turbo V6 from the EA839 family with the turbos in the V. It is rated at 444 hp and 443 lb-ft, and it drives through an eight-speed tiptronic automatic. Turbocharged engines respond far more to software, because a calibration can raise boost, adjust timing, and reshape torque delivery. That is why most RS5 tuning chatter today is about the B9.
Audi RS5 Tuning Paths: Software Options Compared
You have four broad routes on the B9, and a narrower version of the same on the B8:
- ECU flash tunes rewrite the engine calibration directly. Most complete control; late B9 control units may need a bench unlock.
- Piggyback modules sit between sensors and the ECU and modify signals. Easy to remove; less control over the whole calibration.
- Off-the-shelf tunes are prewritten files for stock or lightly modified cars. Affordable and tested on many cars, but not built around yours.
- Custom tunes are built from your data logs. Best for modified cars; costs more and needs a tuner who logs properly.
On the B9, stage labels usually mean this: Stage 1 is software on stock hardware (often with a transmission calibration), Stage 2 adds downpipes and supporting intake or intercooling, and anything beyond that means turbo, fuel, and sensor upgrades. We will not quote dyno numbers here. Results vary with fuel, weather, dyno, and calibration, and anyone promising your exact number in advance is selling, not measuring.
| B8 / B8.5 RS5 | B9 / B9.5 RS5 | |
|---|---|---|
| Engine | 4.2 FSI V8, naturally aspirated | 2.9 TFSI twin-turbo V6 (EA839) |
| Factory rating (US) | 450 hp / 317 lb-ft | 444 hp / 443 lb-ft |
| Transmission | 7-speed S tronic (DL501 / 0B5) | 8-speed tiptronic |
| Response to software | Modest | Strong |
| Key supporting parts | Transmission cooling, chassis, brakes | MAP sensors for higher boost, cooling, brakes |
Both cars share one truth: power is only as useful as your ability to control it. The rear brakes on an RS5 are sized for factory power and factory brake balance. Add a tune, add track days, and heat builds fast.
Shop the Haken Street Rear Big Brake Kit, $1,599.99
✅ Remanufactured OEM calipers and high-carbon rotors ✅ RS5 fitment help from real Audi owners ✅ Fast US shipping
What to Look For in RS5 Supporting Hardware
- ✅ Fitment listed by chassis (B8, B8.5, B9, B9.5), not just the badge.
- ✅ Brake upgrades that keep a working electronic parking brake. A rear kit that deletes it is a daily-driver dealbreaker.
- ✅ Sensors rated for the boost your tune actually targets.
- ✅ Transmission cooling and fluid service planned for the car you have: DL501 on the B8, eight-speed on the B9.
- ✅ Billet solid parts where rubber and plastic flex, without making the car miserable to live with.
Recommended Vorsprung Parts for Audi RS5 Tuning
Brakes for both generations
The Haken Street rear big brake kit is listed for B8, B8.5, B9, and B9.5 A4/S4/RS4, A5/S5/RS5, and Q5/SQ5. It uses a dual-caliper design: a high-performance fixed caliper for stopping and a dedicated electronic parking brake caliper, so the parking brake keeps working. Rotors are high-carbon (3.8% carbon content) for better heat handling. Price: $1,599.99-$1,649.99.
B9 RS5: 4 bar MAP sensors
The factory EA839 MAP sensors read up to 3 bar. Once a calibration targets more boost, the ECU needs to see it. Our 4 bar MAP sensors for the B9 EA839 ($99.99, pair) are a direct upgrade for both the 2.9T and 3.0T, cross-referencing OEM part 04E906051J, and plug into the factory harness. Only install them with a tune that expects 4 bar sensors.
B8 RS5: chassis and transmission
The billet subframe inserts for B8/B8.5 ($79.99) are listed for the S4/RS4, S5/RS5, Allroad, and Q5/SQ5. They fill the voids in the factory subframe mounts to cut flex and sharpen steering feel. For the DL501 gearbox, we offer a DL501 transmission oil cooler adapter ($49.99) and a billet DSG oil filter cap kit ($54.99) to replace the plastic parts that make fluid service nerve-wracking. Browse more in brakes.
RS5 Fitment in Prose
B8 and B8.5 RS5 (4.2 V8): Haken Street rear kit, billet subframe inserts, DL501 cooler adapter, and billet DSG filter cap. B9 and B9.5 RS5 (2.9T): Haken Street rear kit and 4 bar MAP sensors. Our supercharged 3.0T parts do not fit either RS5, and our EA839 ignition coil kit is currently listed for the 3.0T S4, S5, and SQ5 only, so we are not recommending it for the 2.9T until fitment is confirmed.
Install and Tuning Notes
- Rear big brake kits are a half-day job for a competent home mechanic; bleed thoroughly and bed the pads before hard use.
- MAP sensors swap in using the factory retention clips. Flash the matching calibration first.
- Subframe inserts are easiest when the subframe is already loosened for other work.
- On the B8, the DL501 likes clean fluid. Tuned or not, stick to the service interval.
- Log after every change. On the B9, watch intake temps and timing corrections on hot days.
Audi RS5 Tuning FAQ
Is Audi RS5 tuning worth it on the B8 4.2 V8?
It can sharpen throttle response and shifting, but software gains on a naturally aspirated V8 are modest. Meaningful power on the B8 needs hardware, and big numbers need forced induction.
Which RS5 gains more from a tune?
The B9 RS5. Its 2.9 twin-turbo V6 responds strongly to software because a calibration can raise boost and adjust timing, which a naturally aspirated engine cannot do.
Does the Haken rear big brake kit fit the RS5?
The Haken Street rear kit is listed for B8, B8.5, B9, and B9.5 A5, S5, and RS5, plus the A4/S4/RS4 and Q5/SQ5. Confirm your variant with us before ordering.
Do I need 4 bar MAP sensors on a B9 RS5?
Only if your tune targets boost beyond what the factory 3 bar sensors can read. Install them together with a calibration built for 4 bar sensors.
What is the difference between an ECU flash and a piggyback for the RS5?
An ECU flash rewrites the engine calibration directly. A piggyback module modifies sensor signals on the way to the ECU. Flashes offer more control; piggybacks are easier to remove.
What transmission does each RS5 use?
The B8 RS5 uses the seven-speed S tronic dual-clutch (DL501, also called 0B5). The B9 RS5 uses an eight-speed tiptronic automatic.
Bottom Line on Audi RS5 Tuning
Audi RS5 tuning is a different sport on each generation: the B9 twin-turbo wakes up with software, while the B8 V8 rewards chassis, cooling, and hardware work. Either way, stop as hard as you go. The Haken Street rear big brake kit for the RS5 fits both generations, and it is the upgrade that makes every other mod safer to enjoy. For the full map of upgrades, visit our Audi performance upgrades hub.
Shop the Haken Street Rear Big Brake Kit, $1,599.99
Drive the difference. Drive Vorsprung.
Prices checked September 25, 2026 and subject to change.
