Ian McLean

Hi, I am new to this site and joined to try and get some help with my bike. I bought a 1300 XVS Custom (Stryker) in February. The bike rode well but sounded too polite. From videos on you tube i seen a few people has drilled holes into the end plates of the exhausts to improve the sound. However since doing this the bike runs erratically at low revs and stutters and shudders when turning throttle. Is this a simple tune up job for a Yamaha garage or is there anything else i need to do ??