i have a 2000 f 150 5.4 and right now i have cat back with 2 40 series flowmasters. when i accelerate it seems like a rattle underneath the passenger seat but cant tell also is there anyway to make it louder?

 

Get one of these!



But really the rattle could be a loose clamp damaged cat. or a loose heat shield. If you want it louder run true duals no cats.

 

I just HAVE to have that

 

yeah i thought it was mighty funny i was rollin in my truck!

 

if i take the cats off wont my computer go beserk

 

The rattle is prob. a heatsheild on the converter, if you want louder, buy two high flow magnaflow cats, and replace the 4 stockers. If you just take the cats off, it will turn on the CEL.

 

He stated that he had two Flowmaster 40s, so he already has true duals.

 

so really his best bet would be to replace the flowmaster with either a magna flow or roush? Banks?

 

Depends what he wants to do, I personally wouldn't, Flowmaster sounds awesome. The rattle sound I agree with stated above that it could be a loose heat shield on the cat.

If he wants louder, swapping to something else doesn't make sense cause Flowmaster is one of the loudest out there. I do suggest replacing the 4 OEM cats for 2 Magnaflow Hi-Flow cats.

 

How does banks sound on the V8's? Havent got to hear that? And i totally forgot about the 4 OEM cats! Oops.

 

lol yeah, you can still sound good with the OEM cats, but when you get bored of it & want rebel louder, they suck lol.

Banks sounds alright to me. Not as nice as Flowmaster, & Magnaflow though.

http://youtube.com/watch?v=R4s4EoOzgSc

 

Thanks man! yeah i like magnaflow better also!