Tnicklin9 Apr 27, 2020 #1 Been looking around at a back box replacement for my stock K11 back box just wondering what the difference is between the S4 backbox sportex do compare with the S3? cheers Tom.
Been looking around at a back box replacement for my stock K11 back box just wondering what the difference is between the S4 backbox sportex do compare with the S3? cheers Tom.
