High Efficiency Downpipe Upgrade for 2016-2021 Honda Civic 1.5T

Fits all 2016-2021 Honda Civic 1.5T models Fits all variant models including RHD, international models, Etc. Notes: No ECU calibration or tune is required, use of this downpipe will NOT result in a check engine light! This downpipe utilizes a 4.5" 400 cell count EPA compliant GESI G-Sport catalytic converter, for use up to 850hp. This downpipe is compatible with factory and/or most aftermarket front pipes, no adapter necessary. Technical Notes: Research and testing has shown that a downpipe upgrade is one of the most effective modifications to perform when looking to increase efficiency out of Honda's 1.5L turbo engine. Our High Efficiency downpipe upgrade promotes optimal airflow with virtually no turbulence throughout the body of the downpipe. Our design utilizes 304 stainless steel investment cast ends, CNC pocketed for a smooth transition to a 4.5" OD, 400 CPSI GESi G-Sport catalytic converter for the middle body. This 4.5" OD catalytic converter was formulated for small disp