I am having trouble with my competition exhaust thats a bit too noisy, its a 2 1/4 inch diamter pipe, its got bags of pressure going through it which prooves the engine is breathhing in well but not getting the gasses out as good. It wa stested at OULTON at 102 db static test. Its also burnt of some of the powder coating!!!

Im having a large cenre silencer fitted to see if this helps, if not a 2 1/2 inch system may need to be made up.

What exhausts are others using on there race/track cars? And what DB readings are you getting?