Was not aware that Delkevic was a straight bolt-on. Same manufacturers claim this too but often isn't the case so that's a bonus. I wouldn't touch a Black Widow with a barge-poll, as I do not think the quality is up to scratch and the noise is obnoxious. Speaking of which, louder pipes are nothing but obnoxious and do not help you in any shape or form. Pedestrians will jump out of their skin or think "here comes another twat". There is enough science to disprove the louder cans saves lives myth, and Adventure Rider just wrote about this too in their latest publication. Simply put, vehicles do not usually hear the noise until you are next to or in front of them. Also, exhausts are not multi-tone, so you cannot distinguish direction... hence sirens of emergency vehicles are multi-pitch and multi-tone, as your brain can work out the direction. Loud pipes are partly to blame for the bad rep bikers often seem to have and are part of the reason green-laning/offroading is banned - not so much the erosion that bikes can cause, but the noise. I like a v-twin to sound like a proper v-twin, but you can get that beautiful grumble and note, without being noisier.
