These Honda Civic Type R performance exhausts are made in 2.5"/63.5mm pipework and fit from the catalytic converter section backwards (Cat Back) these parts replace the centre and rear sections.
Tailpipe - 4" (101.6mm) Jap style (TP63).
Tailpipe - 6" (152.4mm) x 4" (101.6mm) oval (TP27).