Originally Posted by 1Stunna

Can I also get the difference between the Amuse R1 Titan progress stti and
R1 extra stti?

Any recommendations on where I can purchase at good prices? Also, do u guys think that a y-pipe will make a big difference? Does it all work the same where maker/brand make a difference? I know amuse is got y-pipes for sale also so just considering if I should keep it all the same.

I've seen u guys talking about Dyno but yet to see true dyno results.
Please guys, get at me, really trying to figure out if it's really worth the $$$. It just sounds like a big investment especially just for an exhaust. I know this thread is pretty old but by this time. There is got to be more info and results about it. Since it's been out for awhile now.