I've got the Dinan cat back, love the way it sounds. I can still use the ZHP for work/business and it just sounds like a hotter car....and not like a riceburner or other.....sounds great under load and higher RPMs, when easy on gas its not that noticeable. Sleeper!
http://www.dinancars.com/shop/D660-4...st.aspx#page=1
Tim