APR is soon to release 2 All New B8 A4 Full Exhaust RSC Systems and 2 RSC Catbacks as well as a Race DP for the 2.0T as found in the B8 A4. The new RSC exhaust systems are another new application of Reflective Sound Cancellation Technology which offers a straight through exhaust design with no drone. By utilizing a straight though design, APR is able to maximize power gains when coupled with APR’s Stage 2 ECU Upgrade without uncomfortable levels of exhaust drone while cruising.
During our development we discovered the exhaust systems flowed so well modifications to the software were absolutely required when using the new RSC systems. Spool time was significantly decreased and would result in a rather large overshoot of requested load levels which would cause the throttle to close. This can only be eliminated by properly recalibrating the engine software to match the hardware changes and APR’s Stage 2 ECU Upgrade is born.
The benefits of APR’s Stage 2 ECU Upgrade with APR’s RSC Dual Exit Full Exhaust System are as follows:
1. Turbocharger Boost Onset Reduced by Over 400 rpm’s!
2. Peak Torque is Increased by Over 100 lb ft when Compared to Stock Exhaust and Programming and by Over 70 lb ft when Compared to APR’s Stage 1 ECU Upgrade and Stock Exhaust!
3. Peak Horsepower is Increased by Over 50hp when Compared to Stock Exhaust and Programming and by 29hp when Compared to APR’s Stage 1 ECU Upgrade and Stock Exhaust!
We tested both our Dual Exit and Single Exit RSC Exhaust Systems and found the Dual Exit RSC System to deliver slightly more horsepower in the higher rpm’s as expected.
Now for the numbers as measured by APR!
Stock – 212 HP & 260 TQ
Stage 1 91 Octane – 229 HP & 323 TQ
Stage 2 91 Octane – 239 HP & 353 TQ
Stage 1 93 Octane – 234 HP & 333 TQ
Stage 2 93 Octane – 242 HP & 362 TQ
Stage 1 100 Octane – 268 HP & 338 TQ
Stage 2 100 Octane – 270 HP & 380 TQ
The most impressive aspect of APR’s Stage 1 and 2 ECU Upgrades are the gains they make over stock at different RPM’s:
Stage 1 91 Octane – 35 HP @ 5500 RPM & 64 TQ @ 2250 RPM
Stage 2 91 Octane – 43 HP @ 2650 RPM & 86 TQ @ 2650 RPM
Stage 1 93 Octane – 40 HP @ 5500 RPM & 74 TQ @ 2250 RPM
Stage 2 93 Octane – 46 HP @ 2550 RPM & 95 TQ @ 2550 RPM
Stage 1 100 Octane – 62 HP @ 5500 RPM & 78 TQ @ 2500 RPM
Stage 2 100 Octane – 64 HP @ 5550 RPM & 114 TQ @ 2650 RPM
And now for the dyno graphs for 91, 93 & 100.
As mentioned earlier the dual exit system actually edged out above the single exit system up top just a bit.
And for the sake of comparison, he’s stage 1 vs stage 2:
APR Stage II Software is available now for many ECU’s and we are adding new ECU’s daily.
APR’s Stage 2 ECU Upgrade is a free update for existing APR Stage 1 ECU
Upgrade Owners!
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