Just fitted a Hayward and scott dowpipe (de-cat), Hayward and scott centre section with a Blitz back box (modified to suit) today ready to go into Power Station on Friday to be mapped. The pipe sounds great until about 4500rpm then a really nasty rasp comes in. Has anyone got a simular system? Do they also have a rasp on it? Will the rasp map out?

Am think about binning the system and fitting a Miltek.

HELP!

 

This is mine mate with the original down pipe H&S Centre and BB. Mine doesn't rasp.

 

You don't think it might be the back box making that noise as it won't be the pipe work making a rasping sound.

Ian

 

is it the nur spec or nur spec R?

i got the spec R and with the bung in it makes that sort of sound, but will the bung out, it sounds like the devil is comin to give you some pain lol

 

Just out of interest, I have a standard downpipe and a magnex centre pipe. Would a nur spec R box fit straight on?