HKS Super Turbo Muffler Cat Back Exhaust - 2020-2021 Toyota A90 Supra

The HKS Super Turbo Sound on the A90 Supra

The HKS Super Turbo Muffler Cat Back Exhaust for the 2020-2021 Toyota GR Supra brings the trademark HKS exhaust note to the B58-powered A90 platform. The Super Turbo name refers to HKS's specific internal muffler design. A multi-chamber configuration that produces the aggressive, raspy character the Super Turbo is known for, tuned here for the turbocharged straight-six rather than the naturally aspirated or smaller displacement applications HKS first developed it for. The result is an exhaust that sounds purposeful without crossing into drone.

Specs & Highlights

• Cat-back exhaust system
• HKS Super Turbo muffler design
• Aggressive exhaust note tuned for the B58
• Stainless steel construction
• Fitment: 2020-2021 Toyota GR Supra (A90 / DB22 / DB82 / B48)

Pipe Dimensions, Weight, and Sound Level

The AT005 exits through a 115mm (4.5 inch) single tip. Pipe diameter is 60.5mm (2.375 inch) throughout the system. Muffler body dimensions are 135mm diameter × 340mm length. System weight is approximately 9.6 kg, roughly 2 kg lighter than the OEM Supra muffler assembly. Sound level at WOT is approximately 95 dB(A) at 1m, significantly above the stock system but within tolerable daily-driving range.

What the Super Turbo Does to the B58 Character

The A90 Supra's factory exhaust is tuned for refinement. The valved system manages sound levels carefully and the result is a car that sounds polite for its performance level. The HKS Super Turbo replaces the cat-back section and removes the factory muffler's sound suppression without going full race-pipe. The character is louder and more defined under load, with the turbo spool and blow-off becoming more audible at the top of the rev range where the B58 sounds best.

Bolt-On Installation, Model Year Specific

Installation is a bolt-on replacement using the OEM hangers and factory flange connection. No welding, no cutting. The exhaust diameter and routing follow the OEM path, which means ground clearance and heat shielding are maintained. This is the 2020-2021 specific fitment. Verify your model year before ordering.

The FT Breakdown

The Super Turbo is HKS's most recognizable exhaust product globally and the A90 Supra version translates that character to a platform that deserves it. The B58 responds well to exhaust work and the HKS cat-back is one of the cleaner-looking options in the market for this generation. If you want the sound upgrade without changing the car's character significantly, the Super Turbo is the right starting point. The 115mm single tip and 9.6 kg system weight are the kind of details that separate a properly engineered product from a catalog item. At 95 dB(A) at WOT the Super Turbo is present without being punishing at cruise — that balance is harder to achieve than most people assume.