1) They can be beneficial
2) Yes (tried HiFi Tuning fuses several years ago and was unimpressed, so returned; tried SR Black last summer, same thing; tried SR Blue 3 months ago and let that check cash - - they were definitely worth it in my system).
2) Yes (tried HiFi Tuning fuses several years ago and was unimpressed, so returned; tried SR Black last summer, same thing; tried SR Blue 3 months ago and let that check cash - - they were definitely worth it in my system).