I have a 2012 5.0 automatic with Flowmaster 40 ser axle backs and resonator delete so what will I gain with a X pipe also will I have to get another tune made for the X pipe ?

Thanks I know I did do a search but thought I would post up with my mods and what I should expect for my car.

 

Deja vu all over again.

 

There should be a sticky with this on it;

1) 0-5hp
2) 5-10hp
3) 10-20hp
4) 20-30hp

etc.

btw, what kind of mufflers should I use?

 

No retune and you will gain less horsepower than the 2013s and 2014s have over the 11's and 12's

 

Well if youre removing the cats you will need a tune. A tune alone could get you about 30. And if you plan on removong the cats, I've heard of people picking up 5-10 hp

 

I was going to leave the cats on.