the noise was not why i do not care for them you can here the click and bang going around corners but the car has a 4 inch EX so i like sound .it was no one never told me when you get off of the gas do not go for 2 and hit it some what hard they spool up some i blew 2 gear out of the art car 400 pulling that trick.it would not took out my 2 gear if it was a trutrac so $850. for a coan super sprag latter still have 2 gear