Hi Guys,

I ordered the ultra flow mufflers in 2 1/2". I am thinking I may have made a mistake and should switch my complete exhaust system to 3". My TTI collectors are 3" then they reduce down to 2 1/2" to my TTI Xpipe. I know the motor will make 550-600hp on my current build. This is a 500 cube used for the street. I believe the FAST class is running 2 1/2". What about changing the x pipe to 3" and also the ultra flows then reduce them to 2 1/2 for the tail pipes?