APR is like Dinan, not the most powerful but the easiest on your ride. Also, the more expensive.

 

ehh..honestly id compare mtm to dinan more than apr.. apr is just a step behind giac in terms of harshness...it pushes more boost than most. both asp and mtm are smoother than apr..

** note, thats not at all to say apr is bad, apr makes a very good product, just saying they push it a lil more.