Everyone in my town has flowmasters on their 5.3's and 4.8's. I have sweet thunders on my Trans Am and initially wanted to use one on my truck. My t/a has long tubes and true 3" duals with an X-pipe. I was going to stick a single 3" sweet thunder in place of the stock muffler for the time being. ive read a few posts and It doesn't seem that this isnt the greatest sounding setup out there.

What are some of the best sounding mufflers out there for a truck with stock manifolds and cats ?

 

Thats like asking whats the best kind of music; everyone is going to have their own opinion. I have had magnaflows for several years and like them.

 

Im running LPP LTs and 2.5 inch TDs with a 2.5" DI DO Magnaflow 14" case with a built in X pipe. Sounds like an F Body at cruise and a sprint car at WOT. I love it.

 

lately ive seen quite a few people have borla xr1s, i like mine alot right now with stock stuff. but i dont even have my LT's on yet and i think it might get a little loud for my taste after install, but only one way to find out..

 

i have a borla xr-1 with LT's, its pretty quiet until you get on it..this was with stock manifolds and cats

 

First part of this video is a 14" magnaflow 3" in/ 3" out to a tailpipe

 

slp loudmouth I's. Dynomax bullets. corsa sport of course. Those sweet thunders sound good though.

 

i like my magnaflow 16 inch with LTs
Quiet at cruise loud when u stomp it

 

The first thing I would do is think about "IF" you ever might be going from stock manifolds and cats, to any longtube header and ORY. Reason being, whatever you put on now, will then be a good bit louder.

This is the problem I had. I had stock everything, with a custom bent Flowmaster 1 into 2 dual catback. It sounded great IMO.

Then...

I swapped to longtube headers and an ORY...MUCH, MUCH louder...and that shitty sounding rasp. I wound up with a Hooker Aerochamber installed inline in the "I" pipe and now it's perfect for me. I honestly feel that the truck runs much better at all rpm's now, compared to when it had the loudass raspmaster muffler only. In fact, I truly believe that it was slower than stock with headers combined with the ultra loud catback that sounded so good when it was stock. It runs very well now, for what's done to it.

If I had it to do over, I'd have swapped on the headers first.

Here's idle and rev video of current setup:
http://www.youtube.com/watch?v=6R2-OZCdgTM

Highway cruise (plenty quiet), to WOT for a few seconds:
http://www.youtube.com/watch?v=sehaxoqbZaI

 

lt's ory corsa dumped