Need some help guys. So I'm on the everything350z site listening to the nismo exhaust sounds...and wow it sounds so nice.

The thing is, The Nismo weldina exhaust sounds different...almost raspy. Whats going on here? Are they different exhaust systems? I'm assuming even with recording quality differences the Nismo and Nismo weldina exhaust shouldnt sound that different right????

Anyone have comments on this?