in the next few weeks i will be putting back on my japspeed 4 branch as i took it off as ,coupled with the straight cut 3in full decat stainless exhaust it made it sound quite tinny.and very loud but have now put on a 4 1/2 in back box it has really deepened the note but made it a bit quieter so think i will take the standard headers and try the 4 branch again. plus it will make for good payback on the neigbours dogs waking me up at hal five on the weekend barking. see how he likes it when i leave for work at five thru the week