Flying L Racing Ruby Star 991.1 GT3 RS BBi Exhaust Side Bypass & HRE R101LW Wheels


We would like to take a quick moment to present Flying L Racing’s Ruby Star Porsche 991.1 GT3 RS that we recently swapped out the bulky OEM side mufflers and replaced it with our BBi StreetCup Exhaust Bypass to reduce weight and deliver an aggressive exhaust note that matches the car's race-bred DNA. The side bypass is an excellent alternative to our popular center section exhaust bypass for those prefer a more aggressive Cup Car like sound and maximum weight savings. The factory secondary center exhaust weighs approximately 13 & 19 pounds for the Titanium RS and Stainless non-RS versions and our center section bypass weighs 8 pounds. This equates to only 5 or 11 pounds of weight savings depending on the variant.

To save the maximum weight, we took the same approach as Porsche with their Cup Cars, and bypassed the much heavier primary side mufflers. As shown on the scale, the primary mufflers are weigh approximately 46 pounds total for both the RS and non RS while our BBi bypass pipes are 5 pounds in comparison. That equates to a substantial weight reduction of 89% compared to the original weight of the OEM muffler that we replaced. For durability and protection against corrosion, each set is meticulously TIG welded using 304 aerospace grade stainless tubing with lower carbon content.

BBi Autosport Porsche 991/991 GT3 StreetCup Exhaust Bypass

BBi Autosport Porsche 991/991 GT3 StreetCup Exhaust Bypass

BBI Porsche 997 & 991 GT3/RS Side Exhaust Bypass


  • Produces deep aggressive exhaust notes similar to GT3 Cup Car

  • Meticulously TIG welded

  • Brushed 304 stainless tubing

  • Direct bolt-on replacement

  • Factory secondary center muffler and catalytic converters are all retained

  • 50 state emissions legal and will not void warranty

  • Made in USA

This product is made to order with a lead time of about 3wk. Please email or call for more information or to place an order.


  • bbi.991.202.0003

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Weight Comparison

Removing Bumper to Install BBi Exhaust Bypass

BBi Exhaust Bypass Installed

HRE R101 LW 991 GT3 RS in 19" and 20"/21"
from 9,600.00

HRE’s R101 Lightweight takes the R101 style to the next level. The R101 LW is specifically designed for individual vehicle models creating the ultimate in lightweight optimization for street use. Every vehicle model has a different load rating and power output, so HRE utilized this data to redesign the R101 for each model application fine-tuning each detail of the wheel to remove weight and add stiffness where possible.


  •  Monobloc 1-Piece

  • Aerospace-grade 6061-T6 forged aluminum for high strength-to-weight ratio

  • Engineered to minimize unsprung mass and rotational inertia for maximum performance and handling

  • CNC machined to custom specifications for your specific application

  • OE TPMS and lug hardware compatible for ease of installation

  • Lifetime Limited Structural Warranty and 2 Year Finish Warranty

  • Both 19” & 20” versions are compatible with PCCB

  • 20x9.5/21x12.5 = 18.4 lbs./23.5 lbs

  • 19x9.5/19x12 =17.2 lbs./20.2 lbs.

991 GT3 RS Application Specific

  • 19x9.5 & 19x12

  • 20x9.5 & 21x12.5

  • hre.991.601.0002.19

  • hre.991.601.0002.20

Wheel Diameter:
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