Sean,I install them all the time, the 5" has a deeper sound over the 4". I usually run with a straight thru muffler just to knock of any "edge" on the exhaust note. Let me know if you need any assistance or suggestions on brand/type.
No sound clip. I tried it one day, and the mic on my Sony camera is crap at best; some good wind noise :hahaDo you have any good vids with WOT?? I am afriad if I put on muffler it will be too quiet