I know what you mean. Thing is what sort of mufflers are they using? Used to be Lukey everyone went for but the new Lukeys are just a name - division of Walker now.
The answer would be awesome, but I think the trick is more in pipe lengths and making the pulse timing work. I think that's why T series and XR sound so sweet now. In fact, it will take a lot for me to change my exhaust!
BA'1.5' Pursuit 290
Lightning Strike / Reflective Orange Stripes
'General' Dog - AP's German Shepherd and Best Mate - 02Dec1998-15Dec2003.
'Pepper' Dog - General's and My Little German Shepherd Sweetie - 1996?-02Apr2006.
'Sako' Dog - My Beautiful and Pretty German Shepherd - 2001?-23Aug2006.