hey could anyone help Im getting a whole new system. looking to change out cat for high flow cats. the pipes coming out are 2.5" looking to go to 3" pipe do i start at the rear of cats with 3 there is this correct

 

The OEM system is entire 2.5" with a 2.75" tailpipe.

Cat part #s 94306, and 94106 will work for you, both 2.5", 94106 being louder to give a cat-less sound. The cat mounted O2s will need mounted after the hi-flow cats.

 

so should I just keep the pipes at 2.5" with a 3" tip. darren do you know if anyone sells direct fit cats for the 08 cant find

 

keep 2.5" pipe im looking to go down from 3" because i lost all of my bottom end and have true duals with no cats and i have no bottom end power. 3" sounds good but i dont have the HP / Ftlbs of TQ to push dual 3" pipes.

 

Yes keep it 2.5" but I would get a Magnaflow Y pipe adapter ( 12" Y pipe thats 2.5" dual in 3" single out ) and run 3" to a 3" inlet muffler.

No one makes direct fit cats for the two cat systems yet but direct fit setups are very expensive. Buying the universal cats and having a shop install them is a hell of alot cheaper. Direct fit cats are about $300 per bank so our talking just over $600, universal cats that run $80 each and installed with a $50 an hour labor would be $200 out the door.

 

So the pipes coming from the cats to the Y pipe are 2 1/4? Is that correct for 07

 

nor would a 5.4

 

No, its all 2.5"