It's pretty easy to make a make a catless downpipe that makes power.  It's much harder to make a downpipe with a catalytic converter yet...

License Plate Delete; Billet Aluminum; Black Anodized; CNC Machined "STi" Logo So you relocated your License Plate and now you have those...

?   Add style to your 10th Gen Civic Si (or Sport) Engine Bay with the new TurboXS Anodized Aluminum Oil Cap! Replace the bland plastic...

License Plate Delete; Billet Aluminum; Black Anodized; CNC Machined "TurboXS" Logo So you relocated your License Plate and now you have...

?   Add style to your 10th Gen Civic Si (or Sport) Engine Bay with the new TurboXS Anodized Aluminum Oil Cap! Replace the bland plastic...

TurboXS RFL Catback Exhaust for the Cobalt SS TC is just that "Really Fuckin' Loud".  As with anything we put our "RFL" tag on, this part...