So I had an exhaust shop make my single exhaust and welded an Apexi N1 canister to a pipe. Its sounds great from 1K-6K, but above that, it seems I hear high pitched raspy sounds that I dont like. Could it be the exhaust shop did a cheap job on making it? Do exhaust shops weld differently from other shops? Or is it supposed to sound raspy up top since I am single and not dual?

 

my single is not raspy at all.

 

It's a single exhaust with a Apex N1 muffler, both can make the exhaust loud and raspy.
That's pretty much the nature of the beast. One man's loud and raspy is another's deep and agressive.

If the piping is hitting something under the car, expect it to make even more noise.

 

i have a single exhaust setup t1r..raspy no but it does have vibration because it close to rear brace under car.. though yes the pitch will be very different when engaing vtec...just like slow said its the car