Thermal R&D 3.0" Frontpipe Back Exhaust System for 22+ Honda Civic Si / 23+ Integra 1.5T [FE1/DE4] Read reviews

2022+ Honda Civic Si / 2023+ Acura Integra 1.5T Front Pipe Back Exhaust System

The 11th-generation Honda Civic Si & 5th-generation Acura Integra 1.5T (FE1/DE4) returned with a turbocharged 1.5L L15, a proper 6-speed manual, and a platform that finally deserves a serious exhaust upgrade. Thermal R&D has been engineering performance exhaust systems for Honda and other compact platforms since the early 90s — so when the new Si & Integra launched, building a front pipe back system for it was personal. The result is a complete 2.5" T304 stainless steel exhaust system engineered specifically for their unique exhaust path, tuned for an aggressive, refined tone without drone, and designed as a true bolt-on replacement that uses every factory mounting point.

Key Features:

• Lifetime Warranty Backs Every System We Build
• 2.5" T304 Stainless Mandrel-Bent Tubing For Maximum Exhaust Flow And A Drone-Free Aggressive Sound
• True Helmholtz Technology Cancels Resonant Drone At The Source — Not By Choking Flow
• Internal Helmholtz Chambers For Reduced Weight And A Cleaner, Simpler Install
• High-End Compression Clamps For Maximum Adjustability And Easy Future Maintenance
• Polished or Black Coated Tips — Direct Fit To The Factory Bumper, No Gaps, No Adapters
• Direct Bolt-On Installation Using Factory Mounting Points — No Cutting, No Welding Required
• Manufactured In The USA

Every bend in this system is precision mandrel-bent to keep exhaust velocity consistent from the front pipe all the way through to the black coated tips. The Helmholtz resonance chambers are integrated internally — meaning no external muffler cans to add weight or clutter the undercarriage. The result is straight-through flow with resonance control built into the pipe geometry itself: an aggressive, high-revving tone under hard acceleration that stays composed and controlled at highway cruise.

The black coated tips are engineered to fit flush with the factory rear bumper — no gaps, no visible adapters, no trimming required. 

If you're upgrading your 2022-2027 Honda Civic Si or 2023+ Acura Integra 1.5T exhaust, this front pipe back system is the definitive solution — engineered from the ground up for the FE1/DE4 chassis and backed by a lifetime manufacturer's warranty.