yay or nay? its really cheap and from the youtube vids, doesn't sound too bad. I am a little concerned that the 4 inch exit looks a little too large.

 

The tip looks nice as long as it does not stick out too far.
Macs have a deep aggressive sound..I get nothing but compliments from it.. but it is loud.
You cannot really get a feel for this by listening to sound-clips.. trust me.

It also had a lot of drone (low frequency vibration in the car). A resonator eliminates this problem though.

In my opinion.. of the more aggressive single exhaust set ups out there, a MAC (with resonator) is one of the best. Very gurgly, sounds great at idle, and screams (not raspy) at WOT.

I'll have mine for sale pretty soon.. my wife is buying me a dual set-up for xmas.