Cobra Sport Cat Back System (Oval Tailpipe). Honda Civic Type R (EP3). Pipe Diameter: 2.5 (63.5mm).Tailpipe: (TP27) 6" x 4" Oval Slash Cut. Cobra Sport performance exhausts enhance the sound, looks and quality of your vehicle giving you the ultimate driving experience. 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 - 6" (152.4mm) x 4" (101.6mm) oval (TP27). All relevant fittings and gaskets are supplied.