ROSEVILLE – MUFFLERS: Roseville is under a very strict sound ordinance.  All SRL cars for the August 15th event will be required to be equipped with a suitable muffler and the exhaust must be turned down under the car (not out the door).  Please do your work in the shop.

 If you’ve been there before, you understand – be proactive, not reactive.

From All-American Speedway:

 Exhaust system and noise requirements

Mufflers, single or dual, are mandatory and shall be sufficient enough to meet all sound requirements of All American Speedway at all times. No side exit exhaust. All exhaust shall exit under the car. All mufflers must have a turn down that aims the exhaust exit at the ground. Due to our strict sound restrictions and the effect that weather condition variables have on sound generation, it is highly recommended that additional sound adjustability be built in to your exhaust system in the event your vehicle does not meet the sound levels required.

 All vehicles competing, practicing or testing at All American Speedway are required to comply with the mandated maximum sound output restriction. All individual vehicles are required meet a maximum decibel output of 90 DBA. No exceptions. Any vehicles found to be exceeding the allowable levels will be black flagged from the race track and required to make necessary repairs before being allowed back on the race track.  

MUFFLER/EXHAUST RECOMMENDATION: From an experience team competing at All-American Speedway – Roseville, the following was suggested:

  • Start with the best muffler possible.
  • Install one cone (pointed towards the engine) in front of the muffler.
  • Install a second cone immediately after the muffler.
  • The end of the turn down should be as close to the ground as possible, with the ability to install a third cone in the turn down.