Well long tubes and high flow cats add horsepower, not much when stock, but quite a bit more when you add more boost. The 12568 is actually harder to install because it is longer tham the 12468. The size of the 12568 is actually about the same size as the stock muffler, while the 12468 is shorter, thus it is louder. I am just saying that they dynoed both mufflers and the 12568 posted the best gains. The sound of the 12568 is too muted for my taste. I just ordered a silver bullet. I don't want to start a discussion on this subject. All of us have been told different things by different tuners and we each have different opinions. Let's just leave it at that

Later

 

12468...

sounds great!
performance sucks!

I put my factory back on..12568 is what i would try if you just want performance out of a muffler.. I've never tried that one but everyone says its a gain instead of a loss..I know first hand that the 12468 was a loss from my HP and a loss from my pocket..

 

I myself think the stock muffler has a sweet growl at high revs. I installed the Borla kit and am happy with it. If i had to do it again i would have left the stock muffler alone. No biggie.
later, J-mart

 

I saw these guys at Carlisle a while back.My brother bought a set of SS Magnaflows from them for $120 for the pair!They said that was the regular price.I thought it was pretty good for the SS version.This is from the business card he gave me.


INSTALLER'S SUPPLY
Robert Fehir
1115 4th Ave
Corapolis,PA.15108

(800)-262-2381
(412)-262-3994


I know nothing about this company except what I've written.
Hope this helps someone.