I have a three inch flowmaster american thunder system and I am looking for something with a more agressive sound. I want to keep all the pipes but just replace the muffler. I just hate it wjen evrerything has this mean soud (4th gen & mustangs) and mine is just quiet. Thanks for any help!

 

id suggest trying the same muffler and removing the cat. maybe even get headers. but, if you really want to get a different muffler...i would suggest a hooker aerochamber for an aggressive sound.

 

I have headers and I have to have a cat. Would a high flow cat make it sound any different?

 

Okay I would like some opinions on this...

I have a 350 that should have around 425 hp, I have read that 3 inch exhaust is good for up to 450 hp. when putting the engine in i will be getting rid of the 1 5/8s headers and putting on 1 3/4 i plan on using a 100 shot of nitrious. couldnt i just put cutouts in a custom y pipe to open when I want to use the nitrous? I guess i have never really seen anyone put 2 cutouts in the y pipe has this been done? if so pics? Thanks

 

Why do you want two? Just curious??

86FyrBrd just posted the pics of the cut out he got that's electric. You flip a switch and you have an open exhaust. IIRC, they cost about $140.

It will help if you have one. More air in means more air out, especially with nitrous. Even if you only got one with a cap you have to remove manually, I'm sure it'll help.

 

Your american thunder should be pretty damn loud.


Mine is atleast, and im mostly stock.

 

I listened to your clip, it does sound like what i want. Maybe my cat is clogged up or something, i dont know. maybe a high flow would solve all my trouble. Thanks

 

well, i guess you could use a 3" exhaust system with 425 hp, but i definitely would NOT recommend it. theyre ideal between 250 and 300 hp approximately. for the best performance at full throttle at 425 hp on a 355, id suggest dual 3" or single 4". mufflex sells a 4" system for our cars that looks pretty high quality.

 

i had flowmaster on my 88 formula 350 i liked the sound..

yeah maybe gut the cat and straight pipe it. or go high flow.

 

My firebird has a flowmaster muffler and how much louder would it sound with out the cat.

 

my flowmaster sounds the same just barley louder than the stock muffler.I thought it was going to sound louder i still have the cat on and dont have headers.If i were to take the cat off would it help.

 

Do you have a catback or just muffler? 80 Series?

 

just muffler

 

oh and its the 80 series