Link to description: https://www.hks-power.co.jp/en/product_db/exhaust/db/15336
HKS Stainless Front Pipe for Toyota GT86 / GR86 and Subaru BRZ.
Straight design without catalyzer = Power Up, because of the low exhaust pressure.
The main part for the high output is the exhaust manifold shown on the right graph.
We recommend having a total full straight exhaust tuning by having more power by changing the muffler and exhaust manifold and tune the sound with the front pipe.
If the exhaust manifold is changed, the engine check light might be turn on for a certain combination. So the muffler + front pipe combination is an effective choice.
PN: 33004-BT002