Ok so it's been on for 2500 miles now and I've done lots of motorway driving
The sound has gone very "crisp" nice and raspy and great pops on down shift, sound is still to die for and on the motorway I can't tell any difference at all from standard...but when you medium press the go pedal you get a nice rumble
It's still spot on
no nocks from warped pipes or spilt welds..it's still bang on! Would recommend a group buy purchase with nige as hose service is spot on, really appreciates buisness and makes you happy to spend your hard earned on such a nice friendly person to deal with
Good luck guys!