What do you find gives you more power?

[mdiacont322]

do you guys find that you get more power out of your 5.7 when you:

1) run open cats

or

2) run a high performance muffler (ex. flowmaster, magnaflow, etc.)

Im wondering because im thinking about taking my flowmaster off (feels like theres no power) and getting the magnaflow 15701 kit in a few weeks.

Gimme some ideas on what you think

Mike

 

[TigerEyz3]

Can't address your first one... I live in an emissions testing area.
On the second one, I've run both a Delta Flow 50/SUV muffler and now a Magnaflow catback. In both cases, I had my Thorley headers... I far prefer the performance of the Magnaflow.

 

[young_2010_chris]

it helps alot but u need a programmar if u dont like lookin at ur service engine soon lite

 

[AtomicHoe094]

get some high flow magnaflow cats and a magnaflow muffler and call it a day. still emissions legal too

 

[young_2010_chris]

if u have a saw zaw and a welder its pretty much free tho lol

 

[Brandon X]

Just do one and two. Cut the cat off and use the money from scraping it to buy a nice muffler, and you'll even have money left over! It's a win-win situation!

 

[young_2010_chris]

keep the duals dont y it

 

[mdiacont322]

ok so i will keep the duals... but what kind of muffler should i slap on for best performance?

 

[blueflamed03]

are you sure the muffler is what is holding you back?

Clogged cat?

 

[AtomicHoe094]

are you sure the muffler is what is holding you back?

Clogged cat?

They want you to replace your cat every 75,000 miles. so if your truck is over that, well maybe it is holding you back