Hey guys I have a 1990 F150 and currently have Flowmaster 40 Series Exhaust. SI/DO. I wanted to make it louder but dont know what to do or what different type of muffler to get. Ive heard that a Hi Flow Cat will help. Any help will do. Thanks.

 

I got the Borla XR-1, when I redid my exhaust, its very loud...si/so 3 inch from header collector to tip. I had dual flowmasters super 40's dumped and there is no comparison... The Borla in my opinion is way better in sound performance, from idle to WOT...

 

Ok Ill look into. Thanks.

 

cherry bomb makes a one-chamber SI/DO muffler that you could swap in to replace the two-chamber flowmaster. The one-chamber will be louder than what you have now. Don't get glass packs though, look for the one called Cherry Bomb "Extreme" Muffler.

Flowmaster makes a one-chamber also, but they do not offer it in a SI/DO, just SI/SO. Just a little info for you. good luck.

 

Ok thanks Ill take a look at it.

 

do you have 1 cat or 2?

 

I think 2. Whatever stock it.

 

first thing i would do is cut out the second cat(if 2 cat system) if 1 cat then replace it with a high flow. i have a 2 cat system on mine and cutting out the second cat made a huge difference.

if that still aint loud enough then if your front cat is a dual inlet single outlet then put a y pipe there and put a high flow where your second one is/was. if both are si/so then just put a piece of pipe in place of one and a high flow for the other.

i gutted out my front cat(di/so) and i lost a bit of bottom end power doing this instead of the y pipe but thats because i'm gonna go true dual soon. and i have a high flow in place of my second cat and a knockoff flowmaster 40 series muffler and it is much much louder than with the stock cat setup. it aint super loud or anything(its only a little 302) but it does get some heads to turn.

 

Sorry to bust your bubble, but the single chamber FM is made in si/do. Its not offered on their website, but a friend of mine bought one from a muffler shop and has it installed. Lots of ppl say its not made but it is. just gotta look for it harder lol

 

Ok thanks thats good to know.