Sorry i havnt replied, moved back down to uni after summer and only just sorted out internet. I have only ever used ashley exhausts and its sounds gorgeous on my rs1800, i got the 3 inch so not to loud, but raspy and generally a nice tone! as for performance, i changed the whole exhuast system, decat and 4-2-1 manifold at the same time. it didnt really do anything for low down grunt or torque, but opened it up alot at top end! really pulls much better now after 5k. hope this helps, cheers dan.